Question

$Ca{SO}_4$ is somewhat soluble in water.
$I$. When $H_2{SO}_4$ is added to a solution of $Ca{SO}_4$, the solubility of the $Ca{SO}_4$ will be increased.
$II$. The addition of $H_2{SO}_4$ will lower the $pH$ of the solution.

• A. Statement $I$ is true, Statement $II$ is true
• B. Statement $I$ is true, Statement $II$ is false
• C. Statement $I$ is false, Statement $II$ is true
• D. Statement $I$ is false, Statement $II$ is false

Answer 1

Answer: (C)

Statement $I$ is false, Statement $II$ is true

When $H_{2}S{O}_4$ is added to a $CaS{O}_4$ solution, due to common ion effect, the solubility of $CaS{O}_4$ decreases. Further, as the acid concentration increases, the $pH$ of the solution lowers due to addition of $H_{2}S{O}_4$.

Hence, statement $I$ is false, statement $II$ is true.