Problem: A solution is 0.085 M in Pb2+ and 0.025 M in Ag+. If selective precipitation is to be achieved using NaCl, what minimum concentration of NaCl do you need to begin to precipitate the ion that precipitates first?

FREE Expert Solution

Given: 0.085 M Pb2+ and 0.025 M Ag+ → addition of NaCl will precipitate chlorides (PbCl2 and AgCl)

Comparing Ksp:

Ksp of PbCl2 = 1.7 × 10–5

Ksp of AgCl = 1.8 × 10–10 → lower Kspprecipitates first

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Problem Details

A solution is 0.085 M in Pb2+ and 0.025 M in Ag+. If selective precipitation is to be achieved using NaCl, what minimum concentration of NaCl do you need to begin to precipitate the ion that precipitates first?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Selective Precipitation concept. If you need more Selective Precipitation practice, you can also practice Selective Precipitation practice problems.

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