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2. (5 pts) A solution contains lead (II), copper(I) and silver ions. An HCl solution is used to precipitate out each ion, one
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Answer #1

the fromulae of ppt are AgCl, CuCl and PbCl2

the solubility product of the compounds are given below

compound Ksp
AgCl 1,6 X 10-10
CuCl 1.72 X 10-7
PbCl2 1.75 X 10-5

Higher is the solubility product higher is the solubility. So the order of precipitation is

1. AgCl

2. CuCl

3. PbCl2

The precipitation occurs when ionic product is greater than solubility product. so with lower solubility product the ionic product will be equal or greater than solubility product even at low concentration.

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