Question

Question #43ded

Answer 1

The hydrogen ion concentration is `4.0 ×10^"-8"color(white)(l) "mol/L"`.

Explanation:

The definition of pH is

`"pH" = -log["H"_3"O"^+]`

To get the hydrogen ion concentration, we take the antilogarithm of the pH (the `10^x` button on the calculator).

`["H"_3"O"^"+"] = 10^"-pH"color(white)(l) "mol/L" = 10^"-7.4"color(white)(l) "mol/L"= 4.0 × 10^"-8" color(white)(l)"mol/L"`