Pb(NO3)2 + 2KCl=PbCl2+ 2 KNO3
n(KCl) = c*V=1,4*40*10-3= 0,056 mole
n(Pb(NO3)2)= 0,056/2=0,028 mole
V(Pb(NO3)2)=n/c=(0,028/1,90)*103=14,74 mL
Answer: 14,74 mL Pb(NO3)2
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