The volume of water needed to dissolve 1mg of PbSO4(Ksp=1.44×10−8M2) at 25∘C is approximately:
(molar mass of Pb=207g/mol)
A
10mL
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B
27mL
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C
43mL
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D
80mL
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Solution
The correct option is B27mL Solubility of PbSO4=√Ksp=√1.44×10−8=1.2×10−4MSolubility of PbSO4=1.2×10−4×303×103=36.36mg L−1∴Volume of water needed to dissolve 1 mg of PbSO4=100036.36=27.5mL