Question

Q.22. Give a brief description of the principle of fractional crystallization with an illustration.

Or


Describe the method of separation of glucose and fructose, from their mixture.​

Answer 1

Answer:

22.Fractional crystallization is a method of refining substances based on differences in solubility. Zone refining is a group of similar methods of purifying crystals, in which a narrow region of a crystal is molten, and this molten zone is moved along the crystal (in practice, the crystal is pulled through the heater).

answer no 2

2 . Difference in solubility of glucose and fructose in a particular solvent. Their Solubility in a particular solvent at different temperatures. And their separation by filtration.

Answer 2

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Question 1

»» In fractional crystallization is a method of seperating substances on the basis of their solubility

»» If mixture of two or more substances are allowed to crystallize by allowing the temperature to increase or decrease,then the precipitate formed will contain more of the least soluble substance

»» The proportion of the componente present in the precipitate depends on their solubility product

»» If the solubility products are similar we may have to use a cascade process for complete seperation

»» We usually use this technique in chemical engineering to obtain pure metal

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