Chapter 14, Problem 63E

Calculate $\left[{\text{OH}}^{-}\right]$ given $\left[{\text{H}}_3{\text{O}}^{+}\right]$ in each aqueous solution and classify the solution as acidic or basic.

a. $\left[{\text{H}}_3{\text{O}}^{+}\right]=1.5\times {10}^{-9}\text{M}$

b. $\left[{\text{H}}_3{\text{O}}^{+}\right]=9.3\times {10}^{-9}\text{M}$

c. $\left[{\text{H}}_3{\text{O}}^{+}\right]=2.2\times {10}^{-6}\text{M}$

d. $\left[{\text{H}}_3{\text{O}}^{+}\right]=7.4\times {10}^{-4}\text{M}$