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  4. Assertion: The solubility of salts of weak acids like phosphates decreases at lower pH. Reason: This is because at lower pH concentration of cations increases.

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Q. Assertion : The solubility of salts of weak acids like phosphates decreases at lower $pH$.
Reason : This is because at lower pH concentration of cations increases.

Equilibrium

Solution:

The solubility of salts of weak acids like phosphates increases at lower $pH$ because concentration of the anion decreases due to its protonation. This in turn increases the solubility of the salt so that $K_{sp} = Q_{sp}$.