Use KaKb=Kw for strong acid/base, ICE box for weak?

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Use KaKb=Kw for strong acid/base, ICE box for weak?

Postby Chem_Mod » Sun Aug 21, 2011 12:14 pm

Question: When we calculate the the H3O+ and OH- concentrations for strong acids and bases, can we use KaKb = Kw, because these acids/bases dissociate completely? As opposed to weak acids and bases when we have to use the ICE box?

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Re: Use KaKb=Kw for strong acid/base, ICE box for weak?

Postby Chem_Mod » Sun Aug 21, 2011 12:15 pm

Answer: When you have strong acids and bases that dissociate completely, you can directly calculate the pH (pOH) without having to do an ICE box. You wouldn't use Ka or Kb for strong acids and bases, respectively, because dissociation is assumed to be 100%.


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