Here are the key points about flame photometry:
Instrumentation:
- Flame photometer consists of an atomizer to convert the sample into an aerosol, a burner to produce a flame, an optical system to focus the light from the flame onto a photomultiplier tube, and an electronic circuit to amplify and measure the signal.
Principle:
- When an element is aspirated into the flame, electrons in the atoms get excited to higher energy levels. As they fall back to ground state, they emit light of characteristic wavelengths.
- Sodium emits yellow light at 589 nm, potassium emits violet light at 766.5 nm, lithium emits red light at
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Alkaloids are a group of naturally occurring chemical compounds that contain mostly basic nitrogen atoms. This group also includes some related compounds with neutral and even weakly acidic properties. Some synthetic compounds of similar structure are also termed alkaloids. In addition to carbon, hydrogen and nitrogen, alkaloids may also contain oxygen, sulfur and, more rarely, other elements such as chlorine, bromine, and phosphorus.
Alkaloids are produced by a large variety of organisms including bacteria, fungi, plants, and animals. They can be purified from crude extracts of these organisms by acid-base extraction. Alkaloids have a wide range of pharmacological activities including antimalarial (e.g. quinine), antiasthma (e.g. ephedrine), anticancer (e.g. homoharringtonine),cholinomimetic (e.g. galantamine), vasodilatory (e.g. vincamine), antiarrhythmic (e.g. quinidine), analgesic (e.g. morphine),antibacterial (e.g. chelerythrine), and antihyperglycemic activities (e.g. piperine). Many have found use in traditional or modern medicine, or as starting points for drug discovery. Other alkaloids possess psychotropic (e.g. psilocin) and stimulant activities (e.g. cocaine, caffeine, nicotine, theobromine), and have been used in entheogenic rituals or as recreational drugs. Alkaloids can be toxic too (e.g. atropine, tubocurarine). Although alkaloids act on a diversity of metabolic systems in humans and other animals, they almost uniformly evoke a bitter taste
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Alkaloids are a group of naturally occurring chemical compounds that contain mostly basic nitrogen atoms. This group also includes some related compounds with neutral and even weakly acidic properties. Some synthetic compounds of similar structure are also termed alkaloids. In addition to carbon, hydrogen and nitrogen, alkaloids may also contain oxygen, sulfur and, more rarely, other elements such as chlorine, bromine, and phosphorus.
Alkaloids are produced by a large variety of organisms including bacteria, fungi, plants, and animals. They can be purified from crude extracts of these organisms by acid-base extraction. Alkaloids have a wide range of pharmacological activities including antimalarial (e.g. quinine), antiasthma (e.g. ephedrine), anticancer (e.g. homoharringtonine),cholinomimetic (e.g. galantamine), vasodilatory (e.g. vincamine), antiarrhythmic (e.g. quinidine), analgesic (e.g. morphine),antibacterial (e.g. chelerythrine), and antihyperglycemic activities (e.g. piperine). Many have found use in traditional or modern medicine, or as starting points for drug discovery. Other alkaloids possess psychotropic (e.g. psilocin) and stimulant activities (e.g. cocaine, caffeine, nicotine, theobromine), and have been used in entheogenic rituals or as recreational drugs. Alkaloids can be toxic too (e.g. atropine, tubocurarine). Although alkaloids act on a diversity of metabolic systems in humans and other animals, they almost uniformly evoke a bitter taste
PA 1.pptx introduction to Pharmaceutical AnalysispriyankaRamugade
pharmaceutical analysis -
Pharmaceutical analysis is branch of practical chemistry deals with identification,determination,quantification,and purification of substances
pharmaceutical analysis devided into two types i.e.
1)Qualitative analysis
2)Quantitative Analysis
pharmaceutical analysis have various methods
1) Chemical method
2)Electrical method
3)Instrumental method
4)Biological method
Introduction to Error-Error is define as mistake
errors are categorized into two parts i.e.Absolute error and relative error
Absolute error is the difference between experimental mean value and true value
Relative errors is
Pharmaceutical analysis Definition and scope Different techniques of analysis Methods of expressing concentration Primary and secondary standards. Preparation and standardization of various molar and normal solutions Oxalic acid, sodium hydroxide, hydrochloric acid, sodium thiosulphate, sulphuric acid, potassium permanganate and ceric ammonium sulphate Errors :Sources of errors, types of errors, methods of minimizing errors, accuracy, precision and significant figures
Learning objectives
Introduction
Conditions For Volumetric Analysis
Terms In Volumetric Analysis
Primary Standard
Methods Of Expressing Concentrations In Volumetric Analysis
Types of Titration Methods
Classification Of Titrimetric Or Volumetric Methods
Conclusion
References
Volumetric analysis is a quantitative analytical method which is used widely. As the name suggests, this method involves measurement of the volume of a solution whose concentration is known and applied to determine the concentration of the analyte.
PA 1.pptx introduction to Pharmaceutical AnalysispriyankaRamugade
pharmaceutical analysis -
Pharmaceutical analysis is branch of practical chemistry deals with identification,determination,quantification,and purification of substances
pharmaceutical analysis devided into two types i.e.
1)Qualitative analysis
2)Quantitative Analysis
pharmaceutical analysis have various methods
1) Chemical method
2)Electrical method
3)Instrumental method
4)Biological method
Introduction to Error-Error is define as mistake
errors are categorized into two parts i.e.Absolute error and relative error
Absolute error is the difference between experimental mean value and true value
Relative errors is
Pharmaceutical analysis Definition and scope Different techniques of analysis Methods of expressing concentration Primary and secondary standards. Preparation and standardization of various molar and normal solutions Oxalic acid, sodium hydroxide, hydrochloric acid, sodium thiosulphate, sulphuric acid, potassium permanganate and ceric ammonium sulphate Errors :Sources of errors, types of errors, methods of minimizing errors, accuracy, precision and significant figures
Learning objectives
Introduction
Conditions For Volumetric Analysis
Terms In Volumetric Analysis
Primary Standard
Methods Of Expressing Concentrations In Volumetric Analysis
Types of Titration Methods
Classification Of Titrimetric Or Volumetric Methods
Conclusion
References
Volumetric analysis is a quantitative analytical method which is used widely. As the name suggests, this method involves measurement of the volume of a solution whose concentration is known and applied to determine the concentration of the analyte.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
2. Analytical Chemistry:
Analytical chemistry is the branch of chemistry focused on identifying, quantifying, and
characterizing substances and their properties, enabling precise analysis and measurement in
various scientific and industrial applications.
is mainly divided into two main classes: Qualitative Analysis & Quantitative Analysis.
Quantitative Analysis: The basic principle of quantitative analysis is to determine the
amount or a concentration of a given sample.
There are many methods of Quantitative Analysis such as:
Volumetric Analysis
Gravimetric Analysis
Photoelectric flame photometer.
Spectroscopy
Chromatography(not in syllabus)
3. Volumetric Analysis:
Volumetric analysis, also known as titration, is a widely used technique in analytical
chemistry. It involves the determination of the concentration of a substance (the analyte) in a
solution by reacting it with a solution of known concentration (the titrant).
The principle of volumetric analysis, also
known as titration, is based on the
concept of stoichiometry in chemical
reactions. It involves the careful
measurement of the volume of a solution
of known concentration (the titrant)
required to react completely with a
precisely measured volume of a solution
containing the analyte (the substance of
interest with an unknown concentration)
to determine its concentration or content.
4. Important Terms:
Titration:
Titration is the process of determining the volume of a known-strength (concentration) solution required to react with a known
volume of an unknown-strength solution.
Titrant and Titrate:
The solution placed in a burette during titration is called the titrant, and the solution placed in a conical flask is called the titrate.
Equivalence Point:
The volume at which the reaction actually completes, by adding a stoichiometric amount of titrant, is known as the equivalence
point or theoretical endpoint.
Indicator:
A substance used for visually detecting the completion of a particular reaction to determine the endpoint of a titration is called
an indicator.
Endpoint:
The volume at which the completion of the reaction is observed using an indicator is called the endpoint. Visual observations
may include color changes, fluorescence, or turbidity formation.
Titration Error:
In practice, there is a difference between the equivalence point and the endpoint. This difference is known as the titration error.
Standard Solution:
Volumetric Analysis depends on the use of at least one standard solution. Standard solution is the solution of known strength. A
standard solution is prepared by dissolving an accurate weighted quantity of a highly pure substance.
5. Primary Standard Solution:
A highly pure substance which is used to which is used to prepare standard solution by direct weighting it, is known as
primary standard substance. Standard solution is prepared by dissolving an accurate weighted quantity of a Primary standard
substance. Those substances whose solution can not be prepared by direct weighting are not used as a Primary standard
solution. These types of substances are called as Secondary standard substances. To qualify as a primary standard, a
substance must meet several stringent requirements:
High Purity: A primary standard must be of extremely high purity. Even small impurities can introduce errors in the
analysis, so the substance should be at least 99.9% pure.
Stability: It should be chemically stable, meaning that it doesn't react with the surrounding environment, such as air or
moisture. This stability ensures that the primary standard's composition remains constant over time.
Known Composition: The chemical composition of the substance should be well-defined and known with a high degree of
accuracy. This is essential for accurately calculating the molar mass and stoichiometry of the substance in reactions.
High Molar Mass: Ideally, the substance should have a relatively high molar mass. This makes it easier to weigh out a
precise amount of the substance during preparation.
Solubility: The primary standard should be reasonably soluble in the solvent used for the titration. This property ensures
that the substance can be accurately weighed and dissolved to prepare a standard solution of known concentration.
Non-hygroscopic: It should not be hygroscopic, meaning it should not readily absorb moisture from the atmosphere.
Hygroscopic substances can change in weight due to moisture absorption, leading to errors in concentration calculations.
6. Examples:
Acid Base titration, oxidation Reduction Titration, Precipitation Titration, Complex formation titration:
Terms used to express concentration: Normality ,Molarity, Molality, Mole fraction etc.
Application of Volumetric Analysis:
1. Determining Chemical Concentrations: Volumetric analysis is commonly used to determine the concentration
of acids, bases, salts, and other chemical species in a wide range of samples, including environmental,
pharmaceutical, and industrial solutions.
2. Quality Control in Industry: It plays a crucial role in quality control processes in industries such as food and
beverage, pharmaceuticals, and petrochemicals, where accurate determination of chemical concentrations is
essential to ensure product quality and compliance with standards.
Environmental Monitoring: Volumetric analysis is employed to assess the levels of pollutants in water and air
samples, helping to monitor and manage environmental pollution and ensure compliance with regulatory limits.
Research and Education: Volumetric analysis is a fundamental technique taught in chemistry education and is
extensively used in research laboratories for a wide range of chemical investigations, from studying reaction
kinetics to exploring complex chemical equilibria.
7. Gravimetric Analysis:
The principle of gravimetric analysis is based on the estimation of the mass percent of an ion in an impure
compound of known quantity by determining the mass of the same ion in a pure compound. In order to
determine the mass, the ion of interest needs to be completely isolated.
There are three important types of gravimetric analysis based on the
method of separation employed in the process. They are:
1. Precipitation Method: An analytical method called precipitation
gravimetry uses a precipitation reaction to separate ions from a solution.
2. Volatilization Method: In volatilization gravimetry, the sample is heated
or chemically broken down to separate the components of our mixture.
Any volatile compounds are separated out by the heating or chemical
decomposition, which causes a change in mass that can be measured.
3. Electrogravimetry Method: The principle of electrogravimetry is similar
to electroplating; here, the metal ions are isolated from the solution by
depositing on the surface of the electrode.
8. General procedure for Precipitation method:
• The first step is to selectively precipitate the analyte as a solid compound from the solution by adding a
suitable reagent. This ensures that only the analyte of interest is isolated.
• Filtration: The precipitate is separated from the solution by filtration. The precipitate is collected on a filter
paper, and the filtrate (the liquid portion) is discarded.
• Washing: The collected precipitate is washed with a suitable solvent to remove impurities or any
remaining traces of the solution.
• Drying/Ignition: The wet precipitate is dried to remove any remaining moisture.
• Weighing: The dried precipitate is carefully weighed using an analytical balance to determine its mass.
• Calculation: The mass of the precipitate is used to calculate the concentration or mass percent of the
analyte in the original sample, typically through stoichiometric calculations.
9. You are given a 50g mixture of Barium chloride and inert solid. After being
dissolved in water, an excess of silver nitrate (molar mass=169.875) is added. A
white precipitate is collected and after drying, found to have a mass of 17.48g.
Determine the purity of sample in terms of Chloride.
Given that;
molar mass of Silver (Ag)=107.87 g/mol
Molar mass of Cl=35.45 g/mol
Molar mass of Ba=137.33 g/mol
10. Solution:
Equation : BaCl2(aq) +2AgNO3 →Ba(NO3)2(aq) + 2AgCl(s)
Moles of AgCl = Mass of AgCl /Molar mass of AgCl
= 17.48 g / 143.32 g/mol=0.122 moles.
Since each mole of AgCl contains one mole of chloride ions (Cl-), the moles of Cl ions are the same as the moles of
AgCl:
Moles of Cl ions = Moles of AgCl = 0.122 moles
Molar mass of BaCl2 = 208.23 g/mol
Moles of BaCl2 = Mass of mixture / Molar mass of BaCl2
= 50 g / 208.23 g/mol = 0.240 moles
Since each mole of BaCl2 contains two moles of chloride ions (Cl-), you need to multiply the moles of BaCl2 by 2 to
get the moles of Cl ions.
=2 × Moles of BaCl2 = 2 × 0.240 moles = 0.480 moles.
Purity (%) = (Moles of Cl ions in the precipitate / Moles of Cl ions in the mixture) × 100
= (0.122 / 0.480) × 100 ≈ 25.42%
11. Spectroscopy:
Every compound present in nature possesses the property of absorbing, transmitting, or
reflecting light, which is a form of electromagnetic radiation, at specific wavelengths. This
property can be quantitatively measured using spectrophotometric techniques.
Spectrophotometry is a technique that involves measuring how light interacts with materials.
When light interacts with a material, it can be reflected, transmitted, scattered, or absorbed.
Simultaneously, the material may emit absorbed light with a different frequency due to the
energy it gains from the incident light (e.g., electroluminescence) or its temperature
(incandescence).
Several types of spectroscopic and spectrophotometric methods are applied to analyze
samples. Among them, two primary methods are highly utilized: UV-visible
spectrophotometry, which concerns itself with the reflectance of specific spectra of a given
material within the UV and visible range of the electromagnetic radiation spectrum and
absorption spectrophotometry, which is based on the absorption of radiation at specific
wavelengths of light to obtain an absorption spectrum.
13. Exponential
decrease
Log10(1/T)
Transmittance to Absorbance
Absorbance(A)=Log10(1/T)
The Beer-Lambert Law describes the relationship between the absorption
of light by a substance and its concentration in a solution.
A ∝ c.l (Beer Lambert Law)
A=εcl
Where A=Absorbance, dimensionless, ε(epsilon) = molar absorptivity, also
known as the molar absorption coefficient. It has units of L/(mol·cm) or
L/(mol·dm) , C=Concentration expressed in moles per liter (M),L= the path
length(cm)
Transmittance=I/I0(where I=intensity of light that passes through the
sample and I0= intensity of light before it passes through the sample)
Absorbance(A)=Log10(1/T)
Transmittance(T)= 10-εcl
Log
10
T= Log
10 10-εCL
Log
10
T= -εCL (Log
10 10=1
-Log
10
T= εcl
Log
10(1/T) =εcl (Absorbance)
14. Question
A 0.25M solution in a test tube with path-length of 1cm has an
absorbance of 0.075 at 560nm.
1. What is the molar absorptivity of the solution?
2. What will be the absorbance if the concentration of solution is
0.65M?
3.What is the concentration of the solution if absorbance is 0.450?
16. Question:
The intensity of the incident light on a sample is
0.50w/m2 and the intensity of light entering the
detector is 0.36w/m2.Calculate the transmission and
absorbance.
18. Question:
A solution of thickness 3cm transmits 30%
incident light. Calculate the concentration of
the solution given that the molar absorptivity
is 4000 dm3mol-1cm-1.
19. Answer
Transmittance (T) is 30%, which means =0.30.
l=3cm
A= Log10(1/T)
=Log10(3.33)
=0.523
A=ε.c.l
c=A/ε.l
=0.523/4000dm3mol-1cm-1 ×3cm
=4.35×10-5moles dm-3