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ICE 148: Water and acid dissociation
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Gilbert_5394
#1 Posted : Sunday, June 07, 2020 4:11:51 PM
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For Q148, how do we know water is the main contributor for the acid dissociation?
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INSTR_Katerina_102
#2 Posted : Sunday, June 07, 2020 5:09:44 PM
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Hi,

This type of question often trips me up especially when I am not careful!

Recall the Kw equation where Kw = [H+][OH-], where at 25 degrees C Kw = 1 x10^-14, and [H+] = 1x10^-7 M.

Here, as the concentration given of acid is 10^-8 M, which is one order of magnitude lower than the auto ionization of water where [H+] = 1x10^-7. In cases where the acid concentration is lower than 10^-7, we treat water as the main contributor for the acid dissociation.
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