Question #fe332

1 Answer
May 1, 2016


Yes, your answer is correct.


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.