Ionic EquilibriumHard
Question
For ortho phosphoric acid,
H3PO4 (aq) + H2O (aq) ⇋ H3O+ (aq) + H2PO4- (aq) ; Ka1
H2PO4 (aq) + H2O (aq) ⇋ H3O+ (aq) + HPO42- (aq) ; Ka2
HPO42- (aq) + H2O (aq) ⇋ H3O+ (aq) + PO43- (aq) ; Ka3
The correct order of Ka values is :
H3PO4 (aq) + H2O (aq) ⇋ H3O+ (aq) + H2PO4- (aq) ; Ka1
H2PO4 (aq) + H2O (aq) ⇋ H3O+ (aq) + HPO42- (aq) ; Ka2
HPO42- (aq) + H2O (aq) ⇋ H3O+ (aq) + PO43- (aq) ; Ka3
The correct order of Ka values is :
Options
A.Ka1 > Ka2 < Ka3
B.Ka1 < Ka2 < Ka3
C.Ka1 > Ka2 > Ka3
D.Ka1 < Ka2 > Ka3
Solution
For each weak polyprotic acid Ka1 > Ka2 > Ka3 ................
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