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Question

For the reaction given below:
Pb(NO3)2(aq)+2NaCl(aq) PbCl2+NaNO3(aq)
The volume of 0.75M Pb(NO3)2 in mL required to react completely with 1.0 L of 0.225M NaCl solution is :

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Solution

1.0 L of 0.225 M NaCl corresponds to 1.00×0.225 moles.
Let V be the volume of lead(II) chloride.
The number of moles of PbCl2=V(required)×0.750.
2 moles of NaCl will react with 1 mole of lead nitrate.
Hence, 0.225 moles of NaCl will react with 0.1125 moles of lead nitrate.
V×0.750=0.1125
Thus, the volume is 0.15 L or 150 mL.

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