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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: art1 on May 23, 2006, 09:46:47 AM

Title: calculating H30+ and OH- in .22M KOH
Post by: art1 on May 23, 2006, 09:46:47 AM

Hi guys, I am workign on a problem and I am experiencing some confusion.
Heres what I know

 calculating H30+ and OH- in .22M KOH

I can use the Ionization constant formula to figure out my Kb
I use my Kb in my  Kw formula to figure out the concentrations of the OH and H3O Ions

I think this is true but it says in my book that the procedure is different if the base is a weak base because it will no ionize 100% so the M relationships due to stoicheometry won't be the same.

Can anyone tell me how to do this problem?

Title: Re: calculating H30+ and OH- in .22M KOH
Post by: Borek on May 23, 2006, 09:52:04 AM

No need for Kb, assume all KOH is dissociated.

Calculation of pH of strong acid or base (http://www.chembuddy.com/?left=pH-calculation&right=pH-strong-acid-base).

Title: Re: calculating H30+ and OH- in .22M KOH
Post by: art1 on May 25, 2006, 08:52:49 AM

if there was a Kb needed how would I go about using it?

Title: Re: calculating H30+ and OH- in .22M KOH
Post by: Borek on May 25, 2006, 09:10:35 AM

Calculation of pH of weak acid or base (http://www.chembuddy.com/?left=pH-calculation&right=pH-weak-acid-base).