At $90 \, ^\circ C$,the concentration of $[H_3O^+]$ in pure water is $10^{-6} \, M$. What is the value of $K_w$ at this temperature?
- A$10^{-6}$
- B$10^{-12}$
- C$10^{-14}$
- D$10^{-8}$
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