# Chapter 14 - Acids and Bases - Exercises: 41

$$HClO_4 > HClO_2 > NH_4^+ > H_2O$$

#### Work Step by Step

A larger $K_a$ value determines that the acid is stronger. Therefore, the order is as follows: $$HClO_4 > HClO_2 > NH_4^+ > H_2O$$

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