IF this helps anyone - I may be wrong
1.
Equation involved products of CH3COO- and H3O+ (wouldn't be penalised for no reversible reaction sign) (1)
Equation involved products of CH3COOH2+ and NO3- (as above) (1)
pH = 2.something (2 marks)
pH = 2.something
pH = 3.33 (something around this?) (4 marks)
Ka = 9.09 x 10^-3 Units: mol^-1 dm3 (3 marks)
[salt]/[ethanoic acid] = 1.20 (3 - 1 mark for [H+] = 10^-4.48)
Chlorine atom is very electronegative and withdraws electron density from COO- ion (1)
This makes COO- ion less negative and more stable and acidic (1)
Can't remember the last part of Q1
Random answers - may be wrong
9 peaks
Proton b - had alkyl groups, electron releasing, lone pair more available to accept H+ (converse for proton a which had a benzene ring)
Why use PGA: biodegradable so it can be hydrolysed due to polar bonds (C=O/C-O) so sutures will dissolve over time