Physical Chemistry

Cool goIITian

Joined: 23 Jun 2011
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12 Apr 2012 19:38:39 IST
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pH
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Why is the pH of 10^-6 M HCl 6 but for 10^-7 M HCl it is 6.7?



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GOPAKUMAR's Avatar

Scorching goIITian

Joined: 18 Mar 2010
Posts: 278
12 Apr 2012 21:01:00 IST
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when conc. of strong acid is very low we need to consider common ion effect of [H+] COMMING From water...Now try solving it


Cool goIITian

Joined: 29 Mar 2012
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12 Apr 2012 21:49:04 IST
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 When the concentration of a strong acid is lower than 10^-6 we consider the H+ ions present in water also.

So, the conc of H+ now is=10^-6+10^-7....now it is the same old problem! (10^-7 only at 25 degrees celsius)


Cool goIITian

Joined: 23 Jun 2011
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12 Apr 2012 22:45:21 IST
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Thanx


Cool goIITian

Joined: 29 Mar 2012
Posts: 57
13 Apr 2012 19:49:45 IST
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:)



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