Question

Question #9698a

Answer 1

`pH=0.35`

Explanation:

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

`HCl(aq)->H^+(aq)+Cl^(-)(aq)`

in this case, since the `[HCl]=0.45M`, the concentration of hydrogen ion in solution is also considered to be `[H^+]=0.45M`

The pH of the solution is calculated by:

`pH=-log[H^+]`

`=>pH=-log(0.45)=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.