## Chemistry: The Molecular Science (5th Edition)

The pH of an $(NH_4)_2S$ solution will be greater than 7. This happens because, this salt is formed by a weak acid $(N{H_4}^+)$ and a strong base $(S^{2-})$, therefore, the solution is basic.
To predict the pH range of an salt: 1. Identify the ions that form this salt, and compare its strengths: 2 $N{H_4}^+$: Weak acid. 1 $S^{2-}$: Strong base. Therefore: $S^{2-}$ is the stronger electrolyte, so, the solution is basic. - You can find the constants values on page 624, table 14.2