O-LevelChemistryOrganic Chemistry5070/22 · Oct/Nov 2017 · Q55 Marks
Dilute ethanoic acid reacts with sodium carbonate. Sodium ethanoate, CH3COONa, and two other compounds are formed.
- (a)Construct the equation for this reaction.[2]
- (b)The reaction of dilute ethanoic acid with sodium carbonate is endothermic. Explain in terms of bond making and bond breaking why this reaction is endothermic.[2]
- (c)Ethanoic acid reacts with alcohols to form esters. Give one use of esters.[1]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.
- [1] Correct formulae in 2CH3COOH + Na2CO3 → 2CH3COONa + CO2 + H2O
- [1] Correct balance in 2CH3COOH + Na2CO3 → 2CH3COONa + CO2 + H2O
- [1] Bond breaking is endothermic and bond making is exothermic
- [1] Less energy released (in bond making) than absorbed (in bond breaking)
- [1] Solvents / flavourings / perfumes
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