What is the concentration of $[OH^-]$ in distilled water at $298 \; K$?
- A$1 \times 10^{-5} \; M$
- B$1 \times 10^{-6} \; M$
- C$1 \times 10^{-7} \; M$
- D$1 \times 10^{-8} \; M$
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