(Solved): Question \( 1[19 \) marks] Trimesic acid is a polyprotic acid which contains a benzene ring with t ...

Question \( 1[19 \) marks] Trimesic acid is a polyprotic acid which contains a benzene ring with three carboxylic acid groups. Given pKa values of trimesic acid: \[ p K_{a 1}=2.12 ; p K_{a 2}=4.10 ; p K_{a 3}=5.18 \] a) [4 marks] Write down the three acid dissociation reactions of trimesic acid and calculate their respective acid dissociation constants. Comment on the values of acid dissociation constants calculated. b) [15 marks \( ] \) On a graph paper, sketch the predicted titration curve when titrating \( 15 \mathrm{ml} \) of \( 0.1 \mathrm{M} \) trimesic acid with \( 50 \mathrm{ml} \) of \( 0.1 \mathrm{M} \mathrm{NaOH} \). Calculate and indicate clearly in your graph the initial \( \mathrm{pH} \), final \( \mathrm{pH} \), half-equivalence and equivalence points in your titration curve.