Consider the following equilibria for phosphoric acid., Ask an Expert

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Consider the following equilibria for phosphoric acid. H3PO4 ? H+ + H2PO4- K1 = 7.11 x 10-3 H2PO4- ? H+ + HPO42- K2 = 6.34 x 10-8 HPO42- ? H+ + PO43- K3 = 4.22 x 10-13 a) For an aqueous solution containing phosphoric acid, write a charge balance for this system of equilibria. b) Write a mass balance for a solution containing GaPO4. (Ksp = 1 x 10-21) c) Considering only K3, calculate the solubility for a solution containing excess solid GaPO4 with its pH fixed to a value of 11.0. d Why are K1 and K2 insignificant at pH of 11.0?

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