Answer
(a) $[OH^-] = 8.84 \times 10^{- 11}$
(b) $[OH^-] = 2.19 \times 10^{- 7}$
(c) $[OH^-] = 1.41 \times 10^{- 4}$
(d) $[OH^-] = 3.19 \times 10^{- 13}$
Work Step by Step
(a)
$[H^+] * [OH^-] = Kw = 10^{-14}$
$ 1.13\times 10^{- 4} * [OH^-] = 10^{-14}$
$[OH^-] = \frac{10^{-14}}{ 1.13 \times 10^{- 4}}$
$[OH^-] = 8.84 \times 10^{- 11}$
(b)
$[H^+] * [OH^-] = Kw = 10^{-14}$
$ 4.55 \times 10^{- 8} * [OH^-] = 10^{-14}$
$[OH^-] = \frac{10^{-14}}{ 4.55 \times 10^{- 8}}$
$[OH^-] = 2.19 \times 10^{- 7}$
(c)
$[H^+] * [OH^-] = Kw = 10^{-14}$
$ 7.05 \times 10^{- 11} * [OH^-] = 10^{-14}$
$[OH^-] = \frac{10^{-14}}{ 7.05 \times 10^{- 11}}$
$[OH^-] = 1.41 \times 10^{- 4}$
(d)
$[H^+] * [OH^-] = Kw = 10^{-14}$
$ 3.13 \times 10^{- 2} * [OH^-] = 10^{-14}$
$[OH^-] = \frac{10^{-14}}{ 3.13 \times 10^{- 2}}$
$[OH^-] = 3.19 \times 10^{- 13}$
