Question

The aqueous solution of $FeC{l}_3$ is acidic due to:

• A. Acidic impurities
• B. Ionisation
• C. Hydrolysis
• D. Dissociation

Answer 1

Answer: (C)

Hydrolysis

$FeC{l}_3$ is a salt of weak base $\left(Fe\right(OH{)}_3)$ and strong acid $\left(HCl\right)$.
On hydrolysis it gives acidic solution

$FeC{l}_3+3H_{2}O\to Fe(OH{)}_3+3HCl$