# Chapter 15 - Acids and Bases - Questions & Problems - Page 711: 15.42

$(c) 0.40M$ $CH_3COOH$

#### Work Step by Step

1. Compare the Ka values for each acid. $HCOOH: 1.77 \times 10^{-4}$ $HClO_4 > 1 (Strong$ $acid)$ $CH_3COOH: 1.76 \times 10^{-5}$ 2. The one with the lowest Ka value is the $CH_3COOH$. - With a lower Ka, the $[H^+]$ in a solution with the acid will be lower. (If the acids are in the same concentration) - With a lower concentration of $H^+$, the pH will be higher.

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