What is the concentration of $OH^{-}$ ion in a solution containing $0.05 \ M \ H^{+}$ ions?
- A$2.5 \times 10^{-13} \ M$
- B$5.0 \times 10^{-2} \ M$
- C$2.0 \times 10^{-13} \ M$
- D$4.2 \times 10^{-12} \ M$
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