Question

How to prepare a solid derivative of ester ?

Answer 1

First of all find out whether the derivative of your ester is in solid state or in liquid state or as a volatile substance. If the derivative is in liquid state we cannot make it solid unless you cooled it to its melting point temperature as most of us do experimnets on earth atomspheric pressure ( 1 atm) and a temperature ( 25 ^oC). We call it as STP.

If the ester derivative exist as solid at room temperature the find out in which solvent it will dissolve then dissolve it in that solvent and filter through a filter paper (preferably whatman analytical grade) and evaporate the solvent to get solid derivative in almost pure form.

In another method some solvents itself dissolve-undissolve nature, for example benzoic acid is insoluble in cold water but soluble in hot water, this way benzoic acid is purified. Find out the suitable solvent like that and add the derivative to that solvent, heat it up until all the ester is dissolved, immediately pass it through a filter paper to seperate impurities and then cool the supernatant solution to obtain ester derivative in almost pure form.

Most of the time ester derivatives (lower molecular weight substances) are volatile substances. We know fruits releases some pleasant smell due to esters like isoamyl acetate (banana), octyl acetate (Citrus fruits), hexyl acetate (apple), Butyl acetate (pineapple),. etc. This is because of their lack of hydrogen-bond-donating ability, hence they do not self-associate. Consequently, esters are more volatile compounds.

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