The ff. equilibrium constants have been determined for Phosphoric acid (H3PO4) at 25oC. K’c =   3.5 x 10 -4 K’’c = 4.6 x 10-5 K’’’c = 4.8 x 10-6 What is the equilibrium constant (Kc) for the overall reaction?

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A: Solution:

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A: The number of Pb2+ ions  = 1.2934×1021  

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Q: a. b. Br C.

A: Solution -

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A: the mechanism would be:  

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A: