Re: Difficult acid base problem
- From: Repeating Rifle <salmonegg@xxxxxxxxxxxxx>
- Date: Tue, 31 May 2005 05:32:34 GMT
in article 1117498250.311077.124000@xxxxxxxxxxxxxxxxxxxxxxxxxxxx,
mdawg414@xxxxxxxxx at mdawg414@xxxxxxxxx wrote on 5/30/05 5:10 PM:
> If your concentration of HCl in water is 1.0x10^-1, then your pH is 1.
> If your concnetration of HCl in water is 1.0x10^-5, then your pH is 5.
> However, if your concentration of HCl in water is 1.0x10^-7, what is
> your pH? It cannot be 7 since 7 means that it is neutral. If anyone can
> solve this problem you will forever have my respect.
>
> Thanks,
> Matt
>
As an approximation, You get 10^-7 from the water and 10^-7 from the HCl for
a total of 1*10^-7. Taking the logartithm and all that stuff gives a pH6.7.
As others have pointed out, mass action will slightly modify that result.
Bill
.
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