# Chapter 3 Chemical Reactions - 3-9 Classifying Reactions in Aqueous Solution - Review & Check for Section 3-9 - Page 135: 1

C

#### Work Step by Step

It's an acid-base reaction by definition. ($Ba(OH)_2$ is a base, and $H_3PO_4$ is an acid. It is also a precipitation reaction because it forms $Ba_3(PO_4)_2$, which is insoluble in water.

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