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# What is a solution considered when it has an equal number of hydrogen and hydroxide ions?

Sep 6, 2016

It is considered to be neutral with respect to $p H$.

#### Explanation:

$2 {H}_{2} O r i g h t \le f t h a r p \infty n s H {O}^{-} + {H}_{3} {O}^{+}$

As you know, water undergoes autoprotolysis as represented in the given reaction. Under standard conditions, $\left[H {O}^{-}\right] = \left[{H}_{3} {O}^{+}\right]$, which specifies a condtion of neutrality. To put numbers to this equation, K_w=[H_3O^+][""^(-)OH]=10^-14.

How do I use this equation to define $p H$?

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