Question

What will be the effect on solubility of the precipitate
if pH is decreased, when anion of the salt is the
conjugate of weak acid​

Answer 1

Answer:

Temperature will be the effect on solubility of the precipitate

if pH is decreased, when anion of the salt is the

conjugate of weak acid

Answer 2

The solubility of the precipitate is increased if the pH is decreased when anion of the salt is the conjugate of a weak acid​.

• The anion of a salt that is a conjugate of a weak acid itself acts as a strong base.
• When such a solution is subjected to a change in its pH, the solubility of the precipitate changes.
• Let the reaction be XA ⇔ X⁺ + A⁻
• A decrease in pH means that the solution becomes more acidic. The equilibrium then according to Le Châtelier's Principle shifts in the forward direction to make the solution basic.
• Due to this, more XA will get dissolved.
• Here, XA is the salt, X⁺ is the cation and A⁻ is the anion of the salt is the conjugate of a weak acid​.