At $25 \, ^oC$,the concentration of $H^{+}$ and $OH^{-}$ ions in pure water is $1 \times 10^{-7} \, M$ each. Which of the following is equal to $2 \times 10^{-7} \, M$?
- A$[H^{+}] + [OH^{-}]$
- B$[H^{+}]^2$
- C$[OH^{-}]^2$
- D$[H^{+}] - [OH^{-}]$
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