This document describes the limit test for arsenic using the Gutzeit method. Arsenic in a sample is converted to arsine gas, which reacts with mercuric chloride paper to produce a stain that is compared to a standard stain. The test uses an apparatus with two glass tubes, where the sample is placed below zinc and hydrochloric acid to produce arsine gas, which passes through mercuric chloride paper to produce a stain after 40 minutes. By comparing the intensity of this test stain to the standard stain produced in the same way from a solution of known arsenic concentration, the document determines if the sample passes or fails the limit test for arsenic.
complete details for performing limit test for chlorides its is very helpful for the B.pharmacy 1 year students for both analysis as well as inoganic chemistry.
Arsenic is well known under desirable hand harmful due to its toxic nature, it poses the serious health hazard, which is present in medical substance, many qualitative and quantitative test for arsenic known, however Pharmacopoeia method is based on ‘Gutzeit Method’.
Concentration of arsenic beyond 0.01 mg/L in pollutant by the World Health Organization (WHO).
Reasons:
• Stannous chloride is used for complete evolution of arsine.
• Zinc, potassium iodide and stannous chloride is used as a reducing agent.
• Hydrochloride acid is used to make the solution acidic.
• Lead acetate pledger or papers are used to trap any hydrogen sulphide, which may be evolved along with arsine.
this presentation on limit test for sulphates is very helpful for the diploma and bachelor pharmacy students. this includes principle procedure reaction and observation of limit test.
complete details for performing limit test for chlorides its is very helpful for the B.pharmacy 1 year students for both analysis as well as inoganic chemistry.
Arsenic is well known under desirable hand harmful due to its toxic nature, it poses the serious health hazard, which is present in medical substance, many qualitative and quantitative test for arsenic known, however Pharmacopoeia method is based on ‘Gutzeit Method’.
Concentration of arsenic beyond 0.01 mg/L in pollutant by the World Health Organization (WHO).
Reasons:
• Stannous chloride is used for complete evolution of arsine.
• Zinc, potassium iodide and stannous chloride is used as a reducing agent.
• Hydrochloride acid is used to make the solution acidic.
• Lead acetate pledger or papers are used to trap any hydrogen sulphide, which may be evolved along with arsine.
this presentation on limit test for sulphates is very helpful for the diploma and bachelor pharmacy students. this includes principle procedure reaction and observation of limit test.
General introduction of limit test and limit test for chloride.Mahima Dubey
Limit test of chloride is based on the reaction of soluble chloride with silver nitrate in presence of dilute nitric acid to form silver chloride, which appears as solid particles (Opalescence) in the solution.
Limit tests, Introduction, Definition,
Limit Test For Chlorides
Limit Test For Sulphates
Limit Test For Iron
Limit Test For Lead
Limit Test For Arsenic
Limit tests are quantitative or semi-quantitative tests designed to identify and control small quantities of impurity, which are likely to be present in the substance. The quantity of any one impurity in an official substance is often small, and consequently the visible reaction response to any test for that impurity is also small. The design of individual tests is therefore important if errors are to be avoided in the hands of different operators.
Neutralization curves in acid base analytical titrations, indicators.nehla313
Neutralization curves in acid base analytical titrations, indicators,
strong acid strong base
weak acid strong bse
strong acid weak base
weak acid and weak base
Limit test of sulphate is based on the reaction of soluble sulphate with barium chloride in presence of dilute hydrochloric acid to form barium sulphate which appears as solid particles (turbidity) in the solution.
General introduction of limit test and limit test for chloride.Mahima Dubey
Limit test of chloride is based on the reaction of soluble chloride with silver nitrate in presence of dilute nitric acid to form silver chloride, which appears as solid particles (Opalescence) in the solution.
Limit tests, Introduction, Definition,
Limit Test For Chlorides
Limit Test For Sulphates
Limit Test For Iron
Limit Test For Lead
Limit Test For Arsenic
Limit tests are quantitative or semi-quantitative tests designed to identify and control small quantities of impurity, which are likely to be present in the substance. The quantity of any one impurity in an official substance is often small, and consequently the visible reaction response to any test for that impurity is also small. The design of individual tests is therefore important if errors are to be avoided in the hands of different operators.
Neutralization curves in acid base analytical titrations, indicators.nehla313
Neutralization curves in acid base analytical titrations, indicators,
strong acid strong base
weak acid strong bse
strong acid weak base
weak acid and weak base
Limit test of sulphate is based on the reaction of soluble sulphate with barium chloride in presence of dilute hydrochloric acid to form barium sulphate which appears as solid particles (turbidity) in the solution.
Limt test Pharmaceutical Inorganic chemistry UNIT-I (Part-III) Limit Test.
Limit tests:- Factors affecting limit tests:
Specificity of the tests
Sensitivity
Control of personal errors (Analyst errors)
Test in which there is no visible reaction
Comparison methods
Quantitative determination
Limit test for Chloride: Principle, Procedure, observation and result.
Limit test for Sulphate: Principle, Procedure, observation and result
Limit test for Iron: Principle, Procedure, observation and result.
Limit test for Heavy metal: Principle, Procedure, observation and result.
Limit test for Lead: Principle, Procedure, observation and result.
Limit test for Arsenic: Principle, Gutzet test Procedure, detail in Gutzet Apparatus. observation and result.
Modifies Limit test for Chloride: Principle, Procedure, observation and result.
Modified Limit test for sulphate: Principle, Procedure, observation and result.
The general principle of Agulhon's test is to convert butyric
acid into its copper salt and to extract this with ether. The
copper butyrate imparts a blue color to the ether layer. The
degree of color varies with the concentration of butyrate, the
acidity of the solution and the quantity of copper salt used.
Orsat gas analysis Apparatus detail manufacturer specificationPrashant Ghagare
An Orsat gas analyzer is a piece of laboratory equipment used to
analyze a gas sample (typically fossil fuel flue gas) for its oxygen , carbon monoxide and carbon dioxide content. Although largely replaced by instrumental techniques, the Orsat remains a reliable method of measurement and is relatively simple to use.
Youth Involvement in Poverty Reduction, Waste to Wealth, Erondu Chinonso Ngoz...ESD UNU-IAS
This presentation was part of the 7th African RCE Meeting, 2-4 August 2017 in Lusaka, Zambia “RCE Initiatives: Milestones for Achieving the Sustainable Development Goals”.
Karunakaran book science chemistry fair experiments - highlightsKarunakaran Chandran
A book entitled SCIENCE CHEMISTRY FAIR EXPERIMENTS For Colleges and Schools enclosed herewith the highlights -
This book is an extensive compilation of colourful and interesting chemistry exhibition experiments based on our experience in conducting chemistry fair to school & college students.
• It covers the fundamental principles of more than 40 experiments followed by chemicals / apparatus required, setting up and procedure to carry out the experiments.
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• It also includes cartoon diagrams to understand, set up experiments and to attract the young students towards basic science education and research.
Analysis of Copper In a Brass SampleINTRODUCTIONA. GEN.docxdaniahendric
Analysis of Copper In a Brass Sample
INTRODUCTION
A. GENERAL
In this experiment the percentage of copper present in a brass sample will be
determined spectrophotometrically using a Spectronic 20.
Brass is an alloy consisting of tin, lead, copper, and zinc. The brass sample,has
already been ground to a fine powder.
A standard curve (graph) will be made for Cu'^^ in which a plot of absorbance
(instrument reading from the Spectronic 20) versus molarity of Cu'*"^ for various
solutions will be made. These standard Cu"''^ solutions will be made by dissolving
the appropriate amount of CuS04*5H20 in distilled water. The brass samples will
be made by dissolving the brass in concentrated HNO3 to produce Pb"*'^, Cu"^^, and
Zii^^ in solution along with the finely divided white hydrated tin (IV) oxide solid.
After the properly prepared solutions have been filtered to remove the tindV) oxide,
the absorbance of these solutions will be measured using the Spectronic 20. The
molarity of Cu"^^ in these solutions will be obtained from the standard curve. Then
the percent copper in the brass sample will be calculated.
Before starting this experiment you should read Appendix VIII concerning the
concentration unit: Molarity.
B. METHOD OF ANALYSIS
In each of the five solutions (three for determining the standard curve and two for
the determination of copper in brass) the molarity of Cu"^^ present will be deter
mined spectrophotometrically using the Bausch & Lomb Spectronic 20. The only
species in the solution that absorbs at 620 mp (this wavelength corresponds to the
visible portion of the electromagnetic waves) is Cu"^^. In this aqueous solution Cu"^^
is really present as the aquo complex [Cu(H20)6]+2. The other species, Pb"^^,
H"^, NOs", S04~2, and H2O do not absorb at the 620 mp wavelength of light (and tin
is precipitated as hydrated tin (IV) oxide).
lo
FIGURE 1
Solution
Containing
In the Spectronic 20, light of wavelength of 620 mp. and certain initial inten
sity, Iq, see (Fig. 1) is allowed to pass through the sample. The wider the sample tube
(width = b) and the greater the molarity (M) of Cu"^^, the more absorption will occur
causing the intensity of the 620 mp wavelength (I) to be less as it leaves the solution.
The following equation describes the process quantitatively:
A = logi = abM
where A = absorbance (quantity actually measured by the Spectronic 20), M =
molarity of the absorbing species (Cu"*"^ in this experiment), b = tube diameter, and
a constant which is characteristic of each absorbing species. Since the same tube
(a special tube called a cuvette is used for spectrophotometry) is used throughout
the experiment, b remains constant. Hence, we can define a new constant, K = ab.
Therefore, the above equation becomes;
A = KM = K[Cu+2i
A plot of A (the absorbance value measured by use of the Spectronic 20) versus the
molarity of Cu"^^ should be a straight line going through the origin (A = 0.000 and
M= 0.000).
Three standard Cu"'"^ ...
By
Dr.N.Gopinathan M.Pharm Ph.D
Assistant Professor
Faculty of Pharmacy
Sri Ramachandra
Medical college and Research institute ( Deemed University)
Chennai, Tamilnadu India.
Objectives, applications, Mechanism, official standards of powders, Sieve, Standard for Sieve, Principles, construction, working, uses, merits and demerits of Air separator.
DEFINATION
TYPES OF COUGH
CLASSIFICATION OF EXPECTORANT AND MECHANISM OF ACTION
DEFINATION OF EMETICS
MECHANISM OF ACTION OF EMETICS
COMPOUND RELATED TO EXPECTORANT.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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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.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
How to Make a Field invisible in Odoo 17Celine George
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Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
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Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
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2. LIMIT TEST FOR ARSENIC
• In this test, the test stain obtained by the reaction of arsenic impurities in the form of arsine gas with mercuric chloride
(paper) is compared with standard stain obtained by the reaction of known quantity of arsenic (in the form of arsine gas)
with mercuric chloride.
• A specially designed apparatus is used for the limit test. In addition to the above product AsH(HgBr)2, As(HgBr) and
As2Hg3 are formed which also form yellow or brown stain on the mercuric chloride paper.
2AsH3 + HgCl2 HgAsH2
• Here, Arsenic present is converted to arsenic acid in acid. The arsenic acid is then reduced to arsenous acid.
H3AsO4 H3AsO3
• The nascent hydrogen produced by the reaction of zinc and hydrochloric acid reduces arsenous acid to arsine gas.
H3AsO3 + H2 ASH3 + 3 H2O
3. • Lead acetate cotton is used to remove traces of hydrogen sulphide (in the arsine and hydrogen gas) which is
formed due to presence of any sulphide impurities.
Pb(CH3COO)2 + H2S PbS + 2CH3COOH
The method is called the Gutzeit method
• Stannated hydrochloric acid is used for steady and uniform liberation of hydrogen gas from zinc.
• zinc is not very reactive toward hydrochloric acid, tin forms Sn/Zn couple and makes reaction of zinc and
hydrochloric acid faster.
• Stannous chloride present in Stannated hydrochloric acid reduces arsenic (As5+) to arsenous (As3+).
• Hydrogen gas liberated also act as a carrier gas for arsine.
• Potassium iodide is also added to reduce arsenic to arsenous.
6. GUTZEIT TEST APPARATUS
• The apparatus (see figure) consists of a 100 ml bottle or conical flask closed with a rubber or ground-glass
stopper through which passes a glass tube (about 20 cm X 5 mm).
• The lower part of the tube is drawn to an internal diameter of 1.0 mm, and 15 mm from its tip is a lateral
orifice 2 to 3 mm in diameter.
• When the tube is in position in the stopper the lateral orifice should be at least 3 mm below the lower
surface of the stopper.
• The upper end of the tube has a perfectly flat surface at right angles to the axis of the tube. A second glass
tube of the same internal diameter and 30 mm long, with a similar flat surface, is placed in contact with the
first and is held in position by two spiral springs or clips. Into the lower tube insert 50 to 60 mg of lead
acetate cotton, loosely packed, or a small plug of cotton and a rolled piece of lead acetate paper weighing 50
to 60 mg. Between the flat surfaces of the tubes place a disc or a small square of mercuric chloride paper
large enough to cover the orifice of the tube (15 mm X 15 mm).
7. PROCEDURE
Test stain: Dissolve the given sample in 50 ml water and add 10 ml of stannated hydrochloric acid and transfer
into the arsenic apparatus bottle. Add 5 ml of 1 M potassium iodide and 10 g of zinc AsT. Immediately assemble
the apparatus and immerse the bottle in a water bath at a temperature such that a uniform evolution of gas is
maintained. After 40 minutes observe the stain produced on the mercuric chloride paper.
Standard stain: Transfer 1.0 ml of arsenic standard solution into an arsenic apparatus bottle and dilute to 50 ml
with water. Add 10 ml of stannated hydrochloric acid. Add 5 ml of 1 M potassium iodide and 10 g of zinc AsT.
Immediately assemble the apparatus and immerse the bottle in a water bath at a temperature such that a uniform
evolution of gas is maintained. After 40 minutes observe the stain produced on the mercuric chloride paper.
8. CONCLUSION
Observation:
Test stain is not more intense than standard stain.
OR
Test stain is more intense than standard stain.
Report/Result:
The given sample passes limit test for arsenic.
OR
The given sample fails limit test for arsenic.