# Calculate the {eq}\left [ OH^- \right ] {/eq} in a 1.65 M {eq}NaOH {/eq} solution.

## Question:

Calculate the {eq}\left [ OH^- \right ] {/eq} in a 1.65 M {eq}NaOH {/eq} solution.

## Arrhenius base:

An important type of ionic compound pairs a group 1 or 2 metal cation with a hydroxide anion. Dissolving such a compound in water creates an aqueous solution of the constituent ions. It is termed an Arrhenius base, since its dissociation directly increases the available hydroxide ion molarity, which increases the basicity (increased pH) of a solution.