Question

The pOH of a solution is 10.75. What is the concentration of OH– ions in the solution?
Use StartBracket upper O upper H superscript minus EndBracket equals 10 superscript negative p O H..
3.162 Times. 10–108 M
1.778 Times. 10–11 M
1.075 Times. 102 M
5.623 Times. 1010 M

Answer 1

[OH–] = 10^(-pOH) = 10^(-10.75) = 10^(-10)·10^(-0.75) ≈ 10^(-10)·0.1778 = 1.78 × 10^(-11) M.

Correct choice: 1.778 × 10^(-11) M.