Question

Pre-lab Ouestions for Experiment #11 Determination of the Son Produc t for a Spargely Sole Sale 1) Will a precipitate form when 0.150 Lofo OM N O, and 0.100 L of 0.20 M Nacia (The K. for PbClis 1.2 x 10-)(Show your calculations) 2) Calculate whether a precipitate will form if 2.00 mL of 0.60 MNH, are added to 1.0 L of 1 (Show your calculations) form if 2.00 mL of 0.60 M NH, are added to 1.0 L of 10 x 10-'M FeSO4. (Given that K INHILOH"). (NH3] = 1.8 x 10- and Kp [Fe(OH)) - 1.6 x 10-) 3) Solid silver chromate is added to pure water t o me of the solid remains undissolved. The mixture is stirred for several days to ensure that equilibrium is achieved between the undissolved Ag Cros) and the solution. Analysis of the equilibrated solution shows that its siluer in concentration is 1.3 x 10 M. Assuming that Agro dissociates completely in water and that there are no other important equilibris involving Ag' or CrOcions in the solution, calculate Kip for this compound. -1.8 x 10-19) at 25°C in: 4) Calculate the molar solubility of AgCl (K (a) Pure water (b) 3.0 M NH3 [Hint: AgCl(s) + 2NH3(aq) = Ag(NH3)2(aq) + Cl(aq) K = 3.1 x 10')

Answer 1

1) 0.15 L of olom Pb(NO3)2 0152 x Olomol = 0.015 mol of Pb(NO3)2 Pb(NO3)2 = Pb2+ + 2NO3 App2+ = Pb(NO3)2 = 0.015 mol We also have; O. IL of 0.20 M Nach 0.14 x 0.2 mol = 0.02mol X of Nasi Nace = wat = na-= 0·02 mot Nace Na+ + ci- [Pb2+] = np2t = 0.015 mol (Volume) total (0.15+ 0.1) L = 0.06 molt 1 [ci] = noi = 0.02 mol (Vol total (0.15 to L. = 0.08 molt Pb2+ + 200 Pbc2 Ionic Product (ip) = [Pb 2+][-] ² = (0.06M)(0.08m) 2 = 3.84x104 Ksp (PbC12) = 1.2x105 1. IP >ksp - ppt. of PbCl2 will form