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I'm not sure what that problem is since I have the 6th edition, but I believe it is 10^-14 under lab conditions, which means the temperature is constant. Even then, I'm not sure if it is ALWAYS equal to 10^-14. I'd like to know too, it's a good question!
Kw will be 10^-14 only if the temperature is 25 degrees Celsius. If the temperature is different, the equilibrium constant for the autoprotolysis of water will also be different. This is because autoionization is endothermic, meaning an increase in temperature will result in more products, shifting equilibrium to the right.
Michelle Song 1G wrote:Under what conditions does it not equal 10^-14? For 6B.9 [H3O+][OH-] does not equal 10^-14...
I ran into this same problem and I am not 100% sure why it does not work because it works for the last two parts but it may be because we can not assume that the values of the temperature are constant.
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