# Which solution has a greater concentration of hydrogen ions (H), a solution with a pH of 3 or one with a pH of 7?

Jan 17, 2018

$p H = 3$

#### Explanation:

By the definition of $p H$, it is the potential of hydrogen. It is given by the equation,

$p H = - \log \left[{H}^{+}\right]$

That means, per $1$ unit of lower $p H$, there will be $10$ times more hydrogen ions $\left({H}^{+}\right)$ than the level above.

$3 < 7$

$\therefore p H = 3 > p H = 7$ in terms of $\left({H}^{+}\right)$ ions.