Limescale builds up inside kettles in hard water areas. Limescale is mainly calcium carbonate. One way to remove limescale is to soak it in vinegar.
The table shows the formulae of some carboxylic acids.
| Name of acid | Formula |
|---|---|
| methanoic acid | HCOOH\mathrm{HCOOH}HCOOH |
| ethanoic acid | CH3COOH\mathrm{CH_{3}COOH}CH3COOH |
| propanoic acid | Z |
| butanoic acid | C3H7COOH\mathrm{C_{3}H_{7}COOH}C3H7COOH |
Give the functional group present in all carboxylic acids.
Give the formula of propanoic acid, Z.
Name the carboxylic acid in vinegar.
Describe two things that would be seen when vinegar is added to limescale.
A gas is produced when vinegar reacts with limescale. Name the gas and describe the test for this gas, including the result.
Complete the word equation for this reaction.
ethanoic acid + calcium carbonate →\rightarrow→ .................... + .................... + ....................
43 exam-style questions on Edexcel GCSE Chemistry 10.4 Alcohols and carboxylic acids, covering 10.4.1 Alcohols and the -OH functional group, 10.4.2 Carboxylic acids and the -COOH functional group, 10.4.3 Oxidation of alcohols and homologous series, and 10.4.4 Fermentation and fractional distillation of ethanol. Each one has a worked solution and a mark scheme showing where the marks go.