(a) 25.0 cm of aqueous sodium hydroxide is pipetted into a conical flask.
A few drops of an indicator are added. Using a burette, dilute sulphuric acid is slowly
added until the indicator just changes colour. The volume of acid needed to neutralise
the alkali is noted.
Suggest how you would continue the experiment to obtain pure, dry crystals of sodium
sulphate-10-water.
[4]
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