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

1. Name the apparatus 'A'.
2. Name the substance 'X' placed in 'A' and the substance 'Y' placed in B.
3. State the reason for conducting the titration using the apparatus 'A' and 'B'.
4. State which solution is transferred to the evaporating dish and evaporated to point of crystallization for obtaining the salt.
5. State why titration is not conducted for the preparation of copper [II] sulphate crystals by neutralization.

1. Burette
2. Dil. sulphuric acid (H₂SO₄) is substance 'X' placed in 'A' and sodium hydroxide (NaOH) is the substance 'Y' placed in B.
3. Titration is conducted to determine the completion of the neutralization reaction, i.e. to determine the amount of sulphuric acid required to neutralize a known amount of sodium hydroxide.
4. Aqueous sodium sulphate (Na₂SO₄.10H₂O) is transferred to the evaporating dish and evaporated to point of crystallisation for obtaining the salt.
5. As copper (II) oxide is not soluble in water hence titration is not conducted for the preparation of copper (II) sulphate crystals by neutralization.