POC-II Practical
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The document describes an experiment to recrystallize M-Nitroaniline. Recrystallization is a process where a solute is dissolved in a hot solvent and then allowed to slowly cool and form crystals. The procedure involves dissolving the M-Nitroaniline sample in a minimum volume of hot solvent, filtering any insoluble impurities, slowly cooling the solution to induce crystallization, recovering the crystals through vacuum filtration, washing with cold solvent, and allowing the crystals to dry before determining melting point. The result was that M-Nitroaniline was successfully recrystallized with a melting point of 120°C.
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Crystallization process chemistry
Crystallization is the process of obtaining crystals of a pure substance from its hot, saturated solution. It involves a physical change as no new substances are formed - only a change from liquid to solid state. Crystallization is used to purify naturally occurring impure substances and obtain them in pure crystalline form. There are three main steps: supersaturation of the solution, nucleation where crystal seeds form, and crystal growth. Common applications include purification of drugs, seawater, and in separating substances like alum in industries. Types of crystallization include evaporative, cooling, and reactive crystallization.
Kh pacidbaseneutralization[1]slide onenewthis one
Rinse out the 250 mL flasks that you used to dilute the concentrated acid and base solutions. Weigh out 0.7 to 0.9 g of KHP (pictured below) into a 250 mL flask and dissolve it in 50 mL of distilled water. Add three drops of the phenolphthalein indicator in the flask (see below). Then place the flask under the base buret and start the titration
crystallization of napthalene
RELATIVE RATES OF COMPETING REACTIONS
Chemical behavior is a matter of relative rates of competing reactions.
The competing reaction which occurs the fastest, predominates (makes more product than the other competing reactions).
The predominate reaction is usually the reaction which was the easiest mechanism
STRUCTURE: The Functional Group
The atom or group of atoms that defines the structure of a particular family of organic compounds and, at the same time, determines their properties is called the functional
Crystallization of Napthalene, Lab report for Organic Chemistry
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CRYSTALLIZATION
BASICS OF CRYSTAL
PREPARATION OF CRYSTAL
APPLICATION AND ALL.
Gravimetric analysis
This document discusses the principles and techniques of gravimetric analysis. Gravimetry involves measuring mass or mass changes to determine the quantity of an analyte. Key points include:
Precipitation gravimetry forms an insoluble compound upon addition of a precipitating reagent. The precipitate must be pure with no impurities. Volatilization gravimetry measures mass loss upon vaporization of a volatile component. Particulate gravimetry separates and weighs analytes using filtration or extraction. Proper technique aims to produce pure, contaminant-free precipitates for accurate gravimetric determination.
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Crystallization of Napthalene, Lab report for Organic Chemistry
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POC-II Practical
- 1. Experiment :1- Introduction MR. Shelake R.M.
- 2. Aim • To study the recrystallization of M- Nitroaniline
- 3. What is Recrystallization? - The process where a solution is created by dissolving a solute in a solvent at or near its boiling point.
- 4. Principle: the amount of solute that can be dissolved by a solvent increases with temperature.
- 5. Procedure 1. Dissolve the solid sample in a minimum volume of hot solvent with a boiling stone or boiling stick present. 2. If insoluble impurities are present or charcoal treatment is used, gravity filter the hot solution through a fluted filter paper.
- 6. • 3. Cool the solution slowly to room temperature and then in an ice-water bath to induce crystallization. • 4. Recover the crystals from the cooled recrystallization mixture by vacuum filtration
- 7. • 5. Wash the crystals with a small amount of cold solvent. • 6. Allow the crystals to air-dry completely on a watch glass before weighing them and determining their melting point.
- 9. Result • Recrystallization of Mi nitroaniline 120oc was performed.
- 10. EXPT NO. 2