In an aqueous solution,the sum of $pH$ and $pOH$ is equal to ......
- A$7$
- B$14$
- C$0$
- D$1$
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The $pH$ of pure water or neutral solution at $50\,^{\circ}C$ is .... ($pK_w = 13.26$ at $50\,^{\circ}C$)
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