Reacting acids with carbonates
3 marks · EasyPotassium carbonate is added to an excess of dilute hydrochloric acid.
Name the salt formed.
Name the gas produced.
Write the chemical formula for all products.
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(a) potassium chloride · must show Correct salt name
(b) carbon dioxide · must show Correct gas
(c) KCl, CO2, H2O · must show All correct product formulae
Common mistakes: Incorrect salt name or formula; Omitting water
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Names potassium chloride as the salt.
B1 (b) · 1 mark · Names carbon dioxide as the gas produced.
B1 (c) · 1 mark · Lists all three product formulae: KCl, CO2, H2O.
Worked solution
a) The salt is potassium chloride.
b) The gas is carbon dioxide.
c) Products: KCl, CO2, and H2O.