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Calculating the Equilibrium Constant for Reaction

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If the following data is "true":

H3PO4(aq)<--> H^+(aq) + H2PO4^-(aq) ...... .Ka1 = 7.5x10^-3
H2PO4^-(aq)<--> H+(aq) + HPO4^-2(aq) .............Ka2 = 6.2x10^-8
HPO4^-2(aq) <--> H+(aq) + HPO4^-3(aq) ............Ka3 = 4.8x10^-13

What is Ka for the reaction H3PO4(aq) <--> 3H^+(aq) + PO4^-3(aq)?

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This solution provides step by step for calculating the equilibrium constant for a reaction.

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If the following data is "true":

H3PO4(aq) <--> H+(aq) + H2PO4−(aq) Ka1 = 7.5×10−3
H2PO4−(aq)<--> H+ (aq) + HPO42−(aq) Ka2 = ...

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