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At $$100^\circ\text{C}$$ $$\text{p}K_w$$ of water is 13 and its pH is 6.5. But $$\text{H}_2\text{O}$$ is neutral because ______
Correct Answer: 0
PLACEHOLDER ANSWER - the answer is a reason. Water is neutral because $$[\text{H}^+] = [\text{OH}^-]$$. At $$100^\circ\text{C}$$, $$K_w = 10^{-13}$$, so $$[\text{H}^+] = [\text{OH}^-] = 10^{-6.5}$$ and both pH and pOH equal 6.5. Neutrality means equal concentrations of the two ions, not pH 7.
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