Chemistry

Problem

Equilibrium constant for the acid ionisation of

\text{Fe}^{3+}

\text{Fe}(\text{OH})^{2+}

and

\text{H}^+

6.5 \times 10^{-3}

. What is the maximum pH which could be used so that at least 95% of the total

\text{Fe}^{3+}

in a dilute solution exists as

\text{Fe}^{3+}