Making sodium, potassium and ammonium salts
2 marks · EasyWrite the balanced chemical equation for the preparation of sodium sulfate by titrating sodium hydroxide and sulfuric acid. State the number of moles of sodium hydroxide needed to react completely with 1 mole of sulfuric acid.
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(i) \ce{2NaOH(aq) + H2SO4(aq) -> Na2SO4(aq) + 2H2O(l)}
(ii) 2 moles mol
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Marking points
A1 · 1 mark · Correctly writes the balanced equation for sodium sulfate formation.
A2 · 1 mark · Gives correct number of moles: 2 moles of sodium hydroxide per 1 mole of sulphuric acid.
Worked solution
From the balanced equation, 2 moles of sodium hydroxide react with 1 mole of sulfuric acid (1:2 ratio), so 2 moles of NaOH are needed.