A 0.02 M solution of a tribasic acid H 3 A has a first dissociation of 100%, a second dissociation of 50% and a negligible third dissociation. What is the pH? [Given lo g 3 = 0.48 ]

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A 0.02 M solution of a tribasic acid H 3 ​ A has a first dissociation of 100%, a second dissociation of 50% and a negligible third dissociation. What is the pH? [Given lo g 3 = 0.48 ]

TestHub · Accepted Answer

First step: 0.02 M H + and 0.02 M H 2 ​ A − . Second step (50%): 0.01 M more H + . [ H + ] = 0.03 M . pH = − lo g ( 3 × 1 0 − 2 ) = 2 − 0.48 = 1.52 . Answer: (A).

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