Question

Fractional crystallization produces a pure 1st crop and a less pure 2nd, why does this occur? Explain

Answer 1

According to the question;

As we know that;

In chemistry, fractional crystallization is a method of refining substances based on differences in solubility. It fractionates via differences in crystallization.

So,

If a mixture of two or more substances in solution are allowed to crystallize, for example by allowing the temperature of the solution to decrease or increase, the precipitate will contain more of the least soluble substance.

Then,

The proportion of components in the precipitate will depend on their solubility products. If the solubility products are very similar, a cascade process will be needed to effectuate a complete separation. This technique is often used in chemical engineering to obtain very pure substances, or to recover saleable products from waste solutions.

Then,

A process by which a chemical compound is separated into components by crystallization.

Then,

In fraction crystallization the compound is mixed with a solvent, heated, and then gradually cooled

so that

As each of its constituent components crystallizes, it can be removed in its pure form from the solution.