Question #43ded

1 Answer
May 11, 2014

Answer:

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"#