18. Aqueous Equilibrium - Part 1 of 3
18. Aqueous Equilibrium / Complex Ions: Formation Constant / Problem 14
Pyrophosphate (P2O74−) is added to laundry detergents to prevent the precipitation of insoluble calcium and magnesium salts. Consider a scenario where Na2H2P2O7 is added to the solution and we're trying to dissolve Ca(OH)2 salts because Ca2+ ions form a soluble complex with pyrophosphate.
(a) Given that the Ksp for Ca(OH)2 is 4.7×10–6 and the Kf for [Ca(P2O7)]2− is 4.0×104, determine the equilibrium constant (Keq) for the reaction.
(b) What is the molar solubility of Ca(OH)2 in 2.50 M Na2H2P2O7 solution?
[Ka2 H2P2O72– = 2.51×10–7; Ka3 HP2O73– = 3.89×10–10]
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