Question

Question #fe332

Answer 1

Yes, your answer is correct.

Explanation:

As you know, a solution's pH is simply a measure of its concentration of hydronium ions, `"H"_3"O"^(+)`, which you'll often times see referred to as hydrogen ions, `"H"^(+)`.

More specifically, the pH of a solution is calculated by taking the negative log base 10 of the concentration of hydrogen ions.

`color(blue)(|bar(ul(color(white)(a/a)"pH" = - log(["H"^(+)])color(white)(a/a)|)))`

This means that all you have to do to determine the pH of a solution of known concentration of hydrogen ions is to use that equation. In your case, you know that

`["H"^(+)] = "0.020 M"`

The pH of the solution will thus be

`"pH" = - log(0.020) = 1.699 ~~ color(green)(|bar(ul(color(white)(a/a)1.70color(white)(a/a)|)))`

Therefore, your answer is correct.