Answer
The pH of an $AlCl_3$ solution will be less than 7.
This happens because, this salt is formed by a Lewis acid $(Al^{3+})$ and three negligible bases $(Cl^-)$, therefore, the solution is acidic.
Work Step by Step
To predict the pH range of an salt:
1. Identify the ions that form this salt, and compare its strengths:
1 $Al^{3+}$: Lewis acid.
3 $Cl^-$: Insignificant base.
Therefore: $Al^{3+}$ is the stronger electrolyte, so, the solution is acidic.
