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QuickNotes™ 
pH Calculations, Polyprotic Acids
Use approximations (the 5% rule) in calculating pH in solutions of weak acids or bases
Conjugate bases of weak acids are weak bases and vice-versa
For conjugates KaKb = Kw
Do calculations of pH in solutions of conjugates like acetate and ammonium ions
For polyprotic acids successive Ka values get (much) smaller
Do calculations of pH in solutions of phosphoric acid, phosphate salts
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