Some Basic Concepts of Chemistry - Result Question 112

####49. Upon mixing 45.0mL0.25M lead nitrate solution with 25.0mL of a 0.10M chromic sulphate solution, precipitation of lead sulphate takes place. How many moles of lead sulphate are formed? Also calculate the molar concentrations of species left behind in the final solution. Assume that lead sulphate is completely insoluble.

(1993, 3M)

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Solution:

  1. The reaction involved is

3Pb(NO3)2+Cr2(SO4)33PbSO4(s)+2Cr(NO3)3

millimol of Pb(NO3)2 taken =45×0.25=11.25

millimol of Cr2(SO4)3 taken =2.5

Here, chromic sulphate is the limiting reagent, it will determine the amount of product.

1 mole Cr2(SO4)3 produces 3 moles PbSO4.

2.5 millimol Cr2(SO4)3 will produce 7.5 millimol PbSO4.

Hence, mole of PbSO4 precipitate formed =7.5×103

Also, millimol of Pb(NO3)2 remaining unreacted

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