Ionic EquilibriumHard
Question
Three reactions involving H2PO4- are given below :
(i) H3PO4 + H2O → H3O+ + H2PO4-
(ii)H2PO4- + H2O → HPO42- + H3O+
(iii) H2PO4- + OH- → H3PO4 + O2-
In which of the above does H2PO4- act as an acid ?
(i) H3PO4 + H2O → H3O+ + H2PO4-
(ii)H2PO4- + H2O → HPO42- + H3O+
(iii) H2PO4- + OH- → H3PO4 + O2-
In which of the above does H2PO4- act as an acid ?
Options
A.(ii) only
B.(i) and (ii)
C.(iii) only
D.(i) only
Solution
Only in reaction (ii) H2PO4- acids as ′acid′.
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