# Chapter 15 - Sections 15.1-15.12 - Exercises - Problems by Topic - Page 745: 34a

$NaOH(aq)$ is a base according to the Arrhenius definition.

#### Work Step by Step

According to the Arrhenius definition, a base is a substance which produces $OH^-$ ions in an aqueous solution. As we can see from the below equation, $NaOH(aq) \rightarrow Na^+(aq) + OH^-(aq)$ $NaOH$ produces $OH^-$ ions in aqueous solutions. So it is a base.

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