Question

The solubility product of ferric hydroxide in aqueous solution is $6\times {10}^{-38}$ at $298K$. The solubility of $F{e}^{3+}$ ion will increase when the:

• A. $pH$ is increased
• B. $pH$ is $7.0$
• C. $pH$ is decreased
• D. saturated solution is exposed to the atmosphere

Answer 1

The correct option is C $pH$ is decreased

solubility of $F{e}^{3+}$ ion will increase when conc. of hydroxide ion decreases, when this conc. decreases, conc. of hydrogen ion increases and pH of solution decreases.