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September 20, 2025, 09:54:40 pm
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Author Topic: Rishi's Chemistry Thread  (Read 18560 times)  Share 

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Rishi97

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Re: Rishi's Chemistry Thread
« Reply #90 on: October 13, 2014, 12:11:32 pm »
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Quote from: nhmn0301 on October 13, 2014, 11:57:12 am
A neutral solution (water in this case) has [OH-] = [H+]. So if at 25C, you have pH = 7, hence, [H+]=[OH-]= 10^(-7) => Kw= 10^(-14). At 0 C, pH= 7.5, hence, [H+]=[OH-]= 10^(-7.5) => Kw= 10^(-15). This means that as temperature decrease, Kw decreases, indicating that the self-ionization of water is endothermic. So I think the answer is B.

Correct :)
Thanks heaps nhmn
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