⚡ Show all working — the AI marks against the AQA mark scheme. Method marks awarded for correct working even if the final answer is wrong.
1 markFunctional groupAQA 8462
Which functional group is present in carboxylic acids?
A -OH only
B -COOH (carboxyl group)
C -C=C-
D -CHO
3 marksReaction with carbonateAQA 8462
Describe what you would observe when ethanoic acid is added to sodium carbonate. Write a word equation. (3 marks)
+30 XP
1 markEster formationAQA 8462
Which two functional groups react together to form an ester?
A Two alcohol groups (-OH)
B An alcohol (-OH) and a carboxylic acid (-COOH)
C An alkene and a carboxylic acid
D Two carboxylic acid groups
3 marksWeak acid comparisonAQA 8462 Higher
Ethanoic acid and hydrochloric acid both have concentration 1 mol/dm3. Explain why the ethanoic acid solution has a higher pH than the hydrochloric acid solution. (3 marks)
Hint: Strong acid = fully ionises. Weak acid = partially ionises. Same concentration but different H+ concentration.