Other alkaline solutions

2 marks · Hard

Name one metal compound (other than ammonia or sodium hydroxide) that makes water alkaline and write a balanced equation to show the formation of hydroxide ions in this solution.

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Potassium carbonate;

Also accept: Accept sodium carbonate (with correct balanced equation); Accept equations forming hydroxide ions indirectly

Common mistakes: Giving ammonia, sodium hydroxide, or magnesium hydroxide instead; Incorrect or unbalanced equation

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Marking points

B1 · 1 mark · Names a correct metal compound (e.g., potassium carbonate, sodium carbonate).

B2 · 1 mark · Gives a correct balanced equation showing the formation of hydroxide ions.

Worked solution

An example is potassium carbonate.