This question is about carboxylic acids.
Compound D is a trans stereoisomer of an unsaturated organic acid with the general formula CnH2n−1COOH\text{C}_n\text{H}_{2n-1}\text{COOH}CnH2n−1COOH.
A student plans to analyse acid D by carrying out a titration.
A student first prepares 250.0 cm3250.0\text{ cm}^3250.0 cm3 of a standard solution of 0.120 mol dm−30.120\text{ mol dm}^{-3}0.120 mol dm−3 KOH\text{KOH}KOH for the titration.
The student is provided with solid KOH\text{KOH}KOH and usual laboratory apparatus and equipment.
Describe how the student would prepare the standard solution, giving full details of quantities, apparatus and method.
The student prepares a 250.0 cm3250.0\text{ cm}^3250.0 cm3 solution containing 3.420 g3.420\text{ g}3.420 g of acid D.
The student titrates 25.0 cm325.0\text{ cm}^325.0 cm3 samples of the solution of D with the prepared 0.120 mol dm−30.120\text{ mol dm}^{-3}0.120 mol dm−3 KOH(aq)\text{KOH(aq)}KOH(aq) in the burette.
1 mol KOH1\text{ mol KOH}1 mol KOH reacts with 1 mol1\text{ mol}1 mol of D.
The mean titre of KOH(aq)\text{KOH(aq)}KOH(aq) is 25.00 cm325.00\text{ cm}^325.00 cm3.
Analyse the titration results to determine two possible structures for the trans stereoisomer of organic acid D.
