Question

In: Chemistry

Explain why each of the following actions would negatively impact the results of a recrystallization procedure....

Explain why each of the following actions would negatively impact the results of a recrystallization procedure. Answer each in two sentences or less.

i) After achieving proper dissolution, immediately cooling the solution in an ice bath.

ii) Dissolving all of the material at room temperature, then heating to near the solvent boiling point, followed by cooling to 0 °C.

iii) Upon collection of the recrystallized material on a filter, rinsing with 1-2 mL of room temperature solvent.

Solutions

Expert Solution

answer - i) immediately cooling the solution in ice bath can give many problems like disorder in arrangement , overgrowth of crystal because it do not get enough time to get their order to crystallize that's why it is always said that recrystallization is done by doing slow cooling ( means lowering the solution temperature slowly)

ii) heating the solution to the boiling point of the solvent and than cooling to 0oC means you also doing raipd heating and cooling to your compund which will make compound crystall more disordered and due to which its crystal quality decreases and also doing this also can cause you broken glass ware due to heating cooling effect

iii) washing of recrystallized material with solvent at room temperature simply meaning you are again dissolving it to solvent due to which crystallize material again started dissolving on solvent and also crystal quality also got affected due to this rinsing.

queen_honey_blossom answered 2 years ago
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