Making soluble salts (except sodium, potassium and ammonium salts)
2 marks · EasyA student uses 50 cm³ of dilute sulfuric acid in a beaker to prepare a soluble salt. Give the two reasons for heating the acid gently in this experiment.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
Common mistakes: Not giving both safety and reaction reasons.
Show mark scheme and worked solution
Marking points
B1 · 1 mark · States that heating increases the rate of reaction / dissolves the solid faster.
B2 · 1 mark · States that gentle heating reduces risk of spitting / is safer.
Worked solution
1. Heating the acid increases the rate at which the insoluble base reacts and dissolves. 2. Gentle heating ensures safety by preventing the mixture from spitting.