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April 16, 2014

Homework Help: CHEMISTRY!!!=0

Posted by ALISON on Thursday, March 1, 2012 at 5:38pm.

Determine pH of each solution:

0.20 M KI

i don't know how you know if you use..
K+H2O->KOH + H
or...
I- +H2O--> HIO +H

Im thinking this one...

I- + H2O --> HIO + H
0.20M--------------------0-----------0
0.20-x------------------x-------------x

there is a Ka value for HIO so that is why i made it a product...right? Ka HIO= 2.3X10^2

so..

2.3X10-11 = x^2/ 0.20-x



then do pH.. would that be correct?
so pH=5.7 ?

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