Question

if 125 mL of a solution containing 0.0400 M of Pb(NO3)2 (aq) is mixed with 75.0 mL of a solution containing 0.0200 of NaCl(aq), will there be a precipitate? PbCl3 has a Ksp value of 1.6 x 10^-5. Assume volumes are additive when mixed

Answer 1

thirst, determine the overall and net ionic equations for the reaction that occurs when the two solutions are mixed. + Pb(NO₃), roon +2 Nad cars Pock(s) + 2Nano 3 laas Net ionic: Pb2+ + zce- Pbc2152 - The latter reaction Conbe written in terms of Kspas: PbCl2 is Pb2 + 2Cl cass Ksp = [Pb2+] [e-J2 Using the dilution equation CVI = C2 V2, determine! the initial Concentration of each species once mixed (before any reaction takes place). Total volume of solution = 125mLt 75m2=200mL. (0.0400M of Pb(NO3)2) (125m2) = C₂ (200.0)m C2 for Pb(NO3)2 = 0.025M Similarly Calculation for the Naul yields: ag (0.020om Nach) (15m2) = C₂ (200.00mL C2 for Nacl = 0.0075M using initial Concentrations Calculate the reaction quotient of and Compare to the value of the equilibrium Constant, ksp. = (0.025m Pb2+ (0.0075 M Cl2 = 1.4 x 10-6 = 1.4810-6. Ksp = 1.6810-5 Q<ksp Q is less than ksp so, percipitate of Phcly will not be formed.