Chemistry · Oct / Nov 2025 · Paper 42 · Question 4
0620
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The question as text
Nitric acid, HNO3 , and sulfuric acid, H2SO4 , are strong acids. Ethanoic acid, CH3COOH, is a weak acid. 3
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4(a)(i)[1]
H+
4(a)(ii)[2]
M1 complete (dissociation)
M2 partial (dissociation)
4(a)(iii)[1]
ethanoic (acid)
4(a)(iv)[1]
colourless
4(a)(v)[2]
M1 SO42–
M2 CH3COO –
4(a)(vi)[2]
M1 hydrogen
M2 oxygen
4(a)(vii)[1]
calcium ethanoate
4(b)(i)[1]
proton acceptor
4(b)(ii)[1]
insoluble
4(b)(iii)[1]
aluminium oxide
4(b)(iv)[2]
M1 use of –18 or (9 × –2) or (3 × 3 × –2)
M2 +5
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