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QUESTION

An aqueous solution of lead II phosphate is added to an aqueous solution of potassium iodide. When the two colorless solutions mix, a bright yellow precipitate forms in a double replacement reaction. What is the balanced chemical equation?

PbHPO_4(aq) + 2KI(aq) rarr PbI_2(s)darr + KH_2PO_4

This question is unfortunate as phosphate salts tend to be as soluble as bricks, and lead phosphate, Pb_3(PO_4)_2 would be even more insoluble. Thus I have assumed a biphosphate salt; HPO_4^(2-) can have some solubility (at any rate phosphate ion, PO_4^(3-), is fairly rare, and speciates to HPO_4^(2-) in aqueous solution).