Basicity of acid — is the number of hydrogen ions [H+] which can be produced per molecule of the acid in aq. soln. Acetic acid [CH3COOH] ionises in aq. soln. and gives one hydrogen ion per molecule of the acid, hence acetic acid is monobasic i.e., it’s basicity is one.
Acidity of base — is the number of hydroxyl ions [OH–] which can be produced per molecule of the base in aq. soln. Calcium hydroxide Ca(OH)2 ionises in aq. soln. and gives two hydroxyl ions per molecule of the base, hence calcium hydroxide is a diacidic base i.e., it’s acidity is two.
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.