# Chapter 16 - Questions and Problems - Page 771: 16.29

$[H_3O^+] = 2.51 \times 10^{- 5}M$

#### Work Step by Step

1. Calculate the pH. pOH + pH = 14 9.4 + pH = 14 pH = 4.6 2. Find $[H_3O^+]$ $[H_3O^+] = 10^{- 4.6}$ $[H_3O^+] = 2.51 \times 10^{- 5}$

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