# Question #9698a

Aug 19, 2016

$p H = 0.35$

#### Explanation:

The hydrochloric acid is a strong acid and therefore, it is considered to completely dissociate in water as follows:

$H C l \left(a q\right) \to {H}^{+} \left(a q\right) + C {l}^{-} \left(a q\right)$

in this case, since the $\left[H C l\right] = 0.45 M$, the concentration of hydrogen ion in solution is also considered to be $\left[{H}^{+}\right] = 0.45 M$

The pH of the solution is calculated by:

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

$\implies p H = - \log \left(0.45\right) = 0.35$

here is a complete lesson on how to calculate the pH of a strong acid:
Acids & Bases | pH of a Strong Acid & a Strong Base.