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Topic: pH calculations using Kso  (Read 3008 times)

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Offline KaczuH

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pH calculations using Kso
« on: May 21, 2013, 12:28:52 PM »
Could someone explain to me why this solution doesn't work? Why I have to use ICE method?

Calculate pH of saturated Mg(OH)2 solution Kso=1.1*10-11

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Offline Borek

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Re: pH calculations using Kso
« Reply #1 on: May 21, 2013, 01:56:01 PM »
What about OH- from water autodissociation?

For Mg(OH)2 your approach is OK, it would be problematic for less soluble hydroxides.
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Offline KaczuH

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Re: pH calculations using Kso
« Reply #2 on: May 21, 2013, 03:09:45 PM »
Quote from: Borek on May 21, 2013, 01:56:01 PM
What about OH- from water autodissociation?

This is what i've missed. Everything is correct now. The difference between both results  is approximately 0.2. Thanks!
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