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Question

On mixing 45.0 mL of 0.25 M lead nitrate solution with 25.0 mL of 0.10 M chromic sulphate solution, precipitation of lead sulphate takes place. How many moles of lead sulphate are formed? Assume that lead sulphate is completely insoluble.

A
1
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B
7.5
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C
3.5
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D
4
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Solution

The correct option is B 7.5
The balanced reaction is as follows:
3Pb(NO3)2+Cr2(SO4)33PbSO4+2Cr(NO3)3
The number of mmol of Pb(NO3)2 =45.0×0.25=11.25
The number of mmol of Cr2(SO4)3 =25.0×0.10=2.5
Cr2(SO4)3 is the limiting reagent.
7.5 mmol of Pb(NO3)2 will react with 2.5 mmol of Cr2(SO4)3 to form 7.5 mmol of PbSO4.
11.257.5=3.75 mmol of Pb(NO3)2 will remain unreacted.
Its concentration will be 3.7545.0+25.0=0.0536M

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