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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?

Answer 1

#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).

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Answer 2

Wyatt Adkins

2K3PO4 + Pb3(PO4)2 + 6KI → 3PbI2

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.