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11.11 - Chem 102B Discussion Worksheet#20 Part I Polyprotic...

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Chem 102B – Discussion Worksheet #20 Part I – Polyprotic Acids Polyprotic acids are those with more than one acidic proton. One example is arsenic acid, H 3 AsO 4 , a triprotic acid. It has three equilibrium expressions associated with its reaction with water: Arsenic acid is a weak acid, whose ionization constants decrease as follows: he value of K a1 will be used to calculate the concentration of H 3 AsO 4 , he value of K a2 will be used to calculate the concentration of HAsO 4 2- , he value of K a3 will be used to calculate the concentration of AsO 4 3- , of 1. Consider a 5.0 M solution of H AsO , what are the concentrations of 3 AsO 4 ] = __________ [H 2 AsO 4 - ] = ___________ [H 3 O + ] = ______________ markedly for the second and third dissociation reactions. The concentrations of each of the four species can be calculated T H 2 AsO 4 - , and H 3 O + . These concentrations will not be affected by the other equilibria. T using the previously calculated value of H 2 AsO 4 - and H 3 O + .
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