45). A student hopes to dissolve 0.900 g of Pbl2 in pure water to make 1 L of solution. Will all 0.900 g of Pbl2 dissolve in pure water to make a 1L of solution as hoped by the student? a. All 0.900 g of Pbl2 will dissolve. b. Not all 0.900 g of Pbl2 will dissolve. c. This is way under saturation, so all 0.900 g of Pbl, will dissolve. d. Cannot be predicted
45). A student hopes to dissolve 0.900 g of Pbl2 in pure water to make 1 L of solution. Will all 0.900 g of Pbl2 dissolve in pure water to make a 1L of solution as hoped by the student? a. All 0.900 g of Pbl2 will dissolve. b. Not all 0.900 g of Pbl2 will dissolve. c. This is way under saturation, so all 0.900 g of Pbl, will dissolve. d. Cannot be predicted
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:45). A student hopes to dissolve 0.900 g of Pbl2 in pure water to make 1 L of solution. Will all
0.900 g of Pbl2 dissolve in pure water to make a 1L of solution as hoped by the student?
a. All 0.900 g of Pbl2 will dissolve.
b. Not all 0.900 g of Pbl2 will dissolve.
c. This is way under saturation, so all 0.900 g of Pbl, will dissolve.
d. Cannot be predicted
Expert Solution

Step 1
Since the solubility product of PbI2 = 9.8 X 10-9 at 25 oC
And the solubility reaction of PbI2 is
=> PbI2 (s) ------> Pb2+ (aq) + 2 I- (aq)
Step 2
Assuming the solubility of PbI2 is s. Hence maximum s concentration of PbI2 will dissolve in water
Hence the concentration of ions formed at equilibrium are
[Pb2+ ]= concentration of PbI2 dissolved = s
[I- ] = concentration of PbI2 dissolved X 2 = 2s
Since the solubility product of PbI2 is given by
Ksp = [Pb2+ ][I- ]2
Hence substituting the values we get
9.8 X 10-9 = s X (2s)2
=> s = maximum concentration of PbI2 that can be dissolved = 0.00135 M
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