Phosphoric acid is a triprotic acid, and the Ka values are given below. Calculate pH, pOH,...

Phosphoric acid is a triprotic acid, and the Ka values are given below. Calculate pH, pOH, [H3PO4], [H2PO4 2- ], [HPO4 - ], and [PO4 3- ] at equilibrium for a 5.00 M phosphoric acid solution.

Ka1 = 7.5 x 10-3

Ka2 = 6.2 x 10-8

Ka3 = 4.2 x 10

Expert Solution

here

For every dissociation concentration is decreasing that is why, we assume that

x , , z are smaller than above concentration and hence assumed to be negligible.. Compare to the given one.

Ph = 0.72

POH= 13.28

H3PO4 = 4.807

Hope it clears !

queen_honey_blossom answered 2 years ago

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