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Unformatted text preview: -o Plug into weak acid equilibrium to get new pH HA + H 2 O A-+ H 3 O + += [ ][ -] H3O Ka HA A =- [ ][ -] pH pKa log HA A Now we will do an example and add hydroxide to the buffer system. SEE A Buffer design o Large amount of HA and A-relative to added H 3 O + or OH-o Ratio should be within 0.2 to 4 ([HA]/[A-]) original o Approximately equal amounts of HA and A-o Pick weak acid so that pH desired is about pKa of acid...
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This note was uploaded on 02/22/2009 for the course CHEM 102a taught by Professor Hanusa during the Fall '06 term at Vanderbilt.
- Fall '06