Question

The diagram represents the preparation of sodium sulphate salt from dil. H₂SO₄ acid and sodium hydroxide.

(i) Name the apparatus ‘A’.

(ii) Name the substance ‘X’ placed in ‘A’ and the (substance ‘Y’ placed in B).

(iii)  State the reason for conducting the titration using the apparatus ‘A’ and ‘B’.

(iv) State which solution is transferred to the evaporating dish and evaporated to point of crystallisation for obtaining the salt.

(v)  State why titration is not conducted for the preparation of copper (II) sulphate crystals by neutralisation.

Answer 1

(i)  Burette

(ii)  Dil. H₂SO₄ Sodium Hydroxide

(iii)   Titration is conducted to determine the completion of the neutralisation reaction, i.e. to determine the amount of sulphuric acid required to neutralise a known amount of sodium hydroxide.

(iv)  Sodium Sulphate.

(v)  This is because copper (II) oxide is not soluble in water.