Do you mean the pH of 2 single solutions or a mixture?
With 2 single solutions:
- 25g AlCl3.6H2O: you need to know the equilibrium constant of the hydrolysis reaction AlCl3. And then we calculate the pH as a weak acid.
- 75g absolute ethanol: ethanol is not the electrolyte in water. So the solution is approximate to a neutralized solution.