A mixture of equal parts of a carboxylic acid, a phenol, and a neutral substance

Question

A mixture of equal parts of a carboxylic acid, a phenol, and a neutral substance is to be separated by extraction from an ether solvent. Bicarbonate converts carboxylic acids (but not phenols) to ions. Dissolve about 0.18 g of the mixture (record the exact weight) in 2 mL of t-butyl methyl ether or diethyl ether in a reaction tube. Add 1.0 mLof 3 M aqueous sodium hydroxide to tube 1, shake the mixture thoroughly, allow the layers to separate Based on the above procedure, calculate the following.

a. Calculate the minimum volume of 5% (m/v) sodium hydroxide needed to react with all of the phenol.

Explanation / Answer

3 M NaOH is 3 moles/L

3 x 40 g/mol = 120 g in 1L or 1000g

This is a 12% solution

if 1mL of this solution is required

if the solution is 5% we will need

1 x 0.12 = V x 0.05

V = 2.4 mL of 5% sodium hydroxide solution

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