Specification Point 4.36C (Paper 2C Only):
Describe the reactions of aqueous solutions of carboxylic acids with metals and metal carbonates
Carboxylic acids: A homologous series of organic compounds that all contain the same functional group –COOH.
Reactions of aqueous carboxylic acids with metals and metal carbonates
Carboxylic acids are weak acids, so they can donate a hydrogen ion (H+) in acid-base reactions:
Carboxylic acids will react with metals to produce a salt and hydrogen gas:
Metal + Carboxylic Acid → Salt + Hydrogen
Example: Reaction of ethanoic acid and magnesium
Magnesium + Ethanoic Acid → Magnesium Acetate + Hydrogen
Mg 2CH3COOH Mg(CH3COO)2 H2
Non – Metals
Non-metals will react with metal carbonates to produce a salt, water and carbon dioxide:
Metal Carbonate + Carboxylic Acid → Salt + Water + Carbon Dioxide
Example: Reaction of ethanoic acid and sodium carbonate
Sodium Carbonate + Ethanoic Acid → Sodium Ethoxide + Water + Carbon Dioxide
Na2CO3 2CH3COOH 2CH3COONa H2O CO2
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