Arsenic acid, H 3 AsO 4 , is a polyprotic acid with 3 acidic protons. The equilibrium
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Question:
Arsenic acid, H3AsO4, is a polyprotic acid with 3 acidic protons. The equilibrium below shows the dissociation of the second acidic proton in water:
HAsO2−4(aq)+H3O+(aq)⟺H2AsO−4(aq)+H2O(l)HAsO42−(aq)+H3O+(aq)⟺H2AsO4−(aq)+H2O(l)
Identify the weaker acid then predict whether the equilibrium lies to the left or to the right.
Group of answer choices
HAsO2−4HAsO42−; left
H2AsO−4H2AsO4−; right
H3O+H3O+; right
Cannot be determined without Ka values.
H2OH2O; left
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