posted by Candace .
what volume of 0.100 M NaCl is needed to react completely with 5.00 mL of 0.200 M Pb(NO3)2?
Pb(NO3)2 + 2NaCl ==> PbCl2 + 2NaNO3
How many mols Pb(NO3)2 do you have? mols = M x L = ?
How many mols NaCl does that need? Look at the coefficients. 2x that.
Now M NaCl = mols/L soln.You know mols and M, solve for L which is volume.