Transcription of Chapter 9: POLYPROTIC ACID-BASE EQUILIBRIA
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Chapter 9: POLYPROTIC ACID-BASE EQUILIBRIA
3/28/20141 Chapter 9: POLYPROTIC ACID-BASE EQUILIBRIAI mages available at acid , rhubarb and rhubarb pie1 Understanding POLYPROTIC SpeciesDiprotic acids, H2A vs. Dibasic species, A2-Triprotic acids, H3A vs. Tribasic species, A3-Ex. H2SO4, H2CO3Ex. SO42-, CO32-Ex. H3PO4, Ex. PO43-H3C6H5O7(Citric acid ) C6H5O73-2 Can donate 2 H+ Can accept 2 H+ Can donate 3 H+ Can accept 3 H+3/28/20142 Diprotic Acids and BasesGeneral formulas: H2A= fully acidic form HA-= intermediate form; amphoteric A2-= fully basic or fully deprotonated form3 EQUILIBRIA involved: Diprotic Acids and Bases -+223a1H A + H O HA + H OK First dissociation:Second dissociation:Diprotic acid , H2A Dibasic species, A2-2---2b1A + H O HA + OHK First hydrolysis:--22b2HA + H O H A + OHK Second hydrolysis:Q.
3/28/2014 5 pH Calculations : Diprotic Acids and Bases Problem: Find the pH and concentrations of H 2SO 3, HSO 3-and SO 3 2-in each of the following solutions:(a) 0.050 M H 2SO 3 (b) 0.050 M NaHSO 3, and (c) 0.050 M Na 2SO 3 Note that for diprotic acids and bases , there are 3 species in
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