## Chemistry (4th Edition)

(a)$[OH^-] = 4.21 \times 10^{- 10}M$ (b)$[OH^-] = 1.2 \times 10^{- 6}M$ (c)$[OH^-] = 7.77 \times 10^{- 4}M$ (d)$[OH^-] = 1.75 \times 10^{- 12}M$
(a) $[H^+] * [OH^-] = Kw = 5.48 \times 10^{-14}$ $1.3 \times 10^{- 4} * [OH^-] = 5.48 \times 10^{-14}$ $[OH^-] = \frac{5.48 \times 10^{-14}}{ 1.3 \times 10^{- 4}}$ $[OH^-] = 4.21 \times 10^{- 10}$ (b) $[H^+] * [OH^-] = Kw = 5.48 \times 10^{-14}$ $4.55 \times 10^{- 8} * [OH^-] = 5.48 \times 10^{-14}$ $[OH^-] = \frac{5.48 \times 10^{-14}}{ 4.55 \times 10^{- 8}}$ $[OH^-] = 1.2 \times 10^{- 6}$ (c) $[H^+] * [OH^-] = Kw = 5.48 \times 10^{-14}$ $7.05 \times 10^{- 11} * [OH^-] = 5.48 \times 10^{-14}$ $[OH^-] = \frac{5.48 \times 10^{-14}}{ 7.05 \times 10^{- 11}}$ $[OH^-] = 7.77 \times 10^{- 4}$ (d) $[H^+] * [OH^-] = Kw = 5.48 \times 10^{-14}$ $3.13 \times 10^{- 2} * [OH^-] = 5.48 \times 10^{-14}$ $[OH^-] = \frac{5.48 \times 10^{-14}}{ 3.13 \times 10^{- 2}}$ $[OH^-] = 1.75 \times 10^{- 12}$