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Consider the polyprotic acid HAsO4(arsenic acid), which has the Ka values, in no particular order, of 10-7, 10-2 3, and 10-12 for the equilibria shown below:

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Consider the polyprotic acid HAsO4(arsenic acid), which has the Ka values, in no particular order, of 10-7, 10-2

3, and 10-12 for the equilibria shown below:

Ka1: H3AsO4 (aq) + H2O (l) ⇌ H2AsO4– (aq) + H3O+ (aq)

Ka2: H2AsO4– (aq) + H2O (l) ⇌ HAsO42- (aq) + H3O+ (aq)

Ka3: HAsO42- (aq) + H2O (l) ⇌ AsO43- (aq) + H3O+ (aq)

Correctly identify the values of Ka2 and Ka3

 
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