If the concentration of $OH^{-}$ ions is $10^{-7} \text{ gram ions/litre}$,what is the number of $OH^{-}$ ions in one litre of water?
- A$6.023 \times 10^{16}$
- B$3.023 \times 10^{16}$
- C$6.023 \times 10^{10}$
- D$6.023 \times 10^{11}$
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