Chemistry · May / June 2024 · Paper 42 · Question 4
0620
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The question as text
A carboxylic acid reacts with an alcohol to produce an ester and water. Under certain conditions, this reaction can be reversed so an ester reacts with water to produce a carboxylic acid X and an alcohol Y. The reaction reaches an equilibrium. CH3CH2COOCH3 + H2O X + Y The forward reaction is endothermic.
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4(a)[1]
C2H4O
4(b)[1]
methyl propanoate
4(c)[2]
M1 displayed formula of propanoic acid
M2 propanoic acid
4(d)[2]
M1 structure of CH3OH
M2 methanol
4(e)[4]
M1 decreases
M2 decreases
M3 decreases
M4 no effect
M2 3 ⩾ pH < 7
4(f)(i)[2]
M1 7
4(f)(ii)[1]
H+(aq)
4(f)(iii)[1]
universal indicator
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