## Chemistry 10th Edition

Published by Brooks/Cole Publishing Co.

# Chapter 18 - Ionic Equilibria I: Acids and Bases - Exercises - Mixed Exercises - Page 746: 96

#### Answer

a) Acidic b) Acidic. c) Essentially neutral d) Basic e) Acidic.

#### Work Step by Step

a) $N{H_4}^+$: Weak acid; $HS{O_4}^-$: Weak acid. So, the salt is acidic. b) $N{H_4}^+$: Weak acid and $S{O_4}^{2-}$: Weak base. - Compare it's constants values: We don't have them, but we can compare the values for its conjugate partner. $K_a (HS{O_4}^-) > K_b (NH_3)$ Therefore: $K_b(S{O_4}^-) < K_a(N{H_4}^+)$ $K_a > K_b$: acidic solution. c) $LiCl$ is a salt of strong base $(LiOH)$ and strong acid $(HCl)$; therefore, it is essentially neutral. d) $LiBrO$: Strong base $(LiOH)$ and weak acid $(HOBr)$; therefore, this solution is basic. e) $AlCl_3$: Lewis acid $(Al^{3+})$ and strong acid $(HCl)$: this solution is acidic.

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