Question

1) Will a precipitate form when 0.150 L of 0.10 M Pb(NO3)2 and 0.100 L of 0.20 M NaCl are mixed? (The K., for PbClzis 1.2 x 10-5 (Show your calculations) 2) Calculate whether a precipitate will form if 2.00 ml. of 0.60 M NH, are added to 1.0 L of 1.0 X 10 M FeSO4. (Show your calculations) (Given that Ko - NSON - 1.8 x 10 and Kp [Fe(OH):) - 1.6 10-") [NH, 3) Solid silver chromate is added to pure water at 25 °C, and some of the solid remains undissolved. The mixture is stirred for several days to ensure that equilibrium is achieved between the undissolved Ag CrOd(s) and the solution Analysis of the equilibrated solution shows that its silver ion concentration is 1.3 X 10 M. Assuming that Ag Cro dissociates completely in water and that there are no other important equilibria involving Ag' or Cro, ions in the solution, calculate Kep for this compound. 4) Calculate the molar solubility of AgCl (Kp - 1.8 x 10") at 25 "Cin: (a) Pure water (b) 3.0 M NH, [Hint: AgCl(s) + 2NH3(aq) Ag(NH3)2(aq) + Cl(aq) K - 3.1 X 101

Answer 1

Page NU. Date 10.150 L of o.1om PbCnon mirud with orool of 0.20 m nal. total volume 0.250 2 250 ml Pb(No), y plat +2002) so o. 10 mod ab (nog), sive olo mole Pop and Nail & Natten 16.20 Nad give 0.2 mole of ce? these are present in 250 ml ... Calculate the molar Cain of these in that is no. of moles of sons in loml. 1250 ml Contein Olomole (22+ 1000 lill → 0.10X140.40 124_ Similarlo I lovo nal Centein 0.20 xh. 0.80 cl LPbcl Pb²+ face La dip - Splet] [a]? = [0.40] [ado] - Osp = 0.256 9.56 x lot I Kp = 1.0.Xlos, as Oupa kip cs Scanned with proudon Will occule CamScanner