What this practice covers
These questions are drawn from past CIE 0620 Chemistry papers and filtered to preparation of salts. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
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What examiners see students get wrong here
These are the errors that cost marks on preparation of salts, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Using a metal to make a sodium or potassium salt, when sodium and potassium react violently with acid.
- Trying to filter off excess alkali, which is soluble.
- Leaving the indicator in during the second titration, so the crystals are coloured.
- Evaporating the solution to dryness instead of to the point of crystallisation, which spoils the crystals.
- Forgetting to wash the precipitate, leaving the soluble salt behind.
- Saying the excess solid is added so the reaction goes faster, rather than to use up all the acid.
- Choosing precipitation for a soluble salt, which would leave both salts in the same solution.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Preparation of salts revision notes.