3. The following solvent selection data were collected for an impure sample of s

Question

3. The following solvent selection data were collected for an impure sample of solid compound A (mp solubility at RT solubility at BP crystals upon cooling? Insoluble Solvent Methanol (bp 65 oC) Insoluble Chloroform (bp 61 oC) Soluble Very few Cyclohexane (bp 81°C) Soluble Many Insoluble Dichloromethane (bp 41°C) Insolubie Soluble Many Toluene (bp 111 °C) Slightly soluble Soluble Very few Based on these results, what solvent would you choose for your recrystallization? Explain your answer. (6 pts) 4. The goal of recrystallization is to obtain a purified sample with minimal loss of yield. Explain why this goal would be adversely affected by the following: a. An unnecessarily large volume of recrystallizing solvent was used. (5 pts) TE use o mere h saa en durin then desire d neary stale 20 ti ora dissolved re cover of b. The flask was shaken while cooling to accelerate crystallization. (5 pts) c. The flask was not put on ice prior to filtration/centrifuging. (5 pts) So,Tr rask voile not put on ice. prior to filtration the recover will be them ac

Explanation / Answer

For recrystalization of any compound we need a sutaible solvent

Compound should be

1) not soluble at room temperature

2) soluble at boiling tempreture

3) crystal should obtain after cooling

So from above data

Cyclohexene and Dichloromethane are durable solvents

To that of Dichloromethane is good as it will easily removed (bp.41)

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