Question

Principle of Chemistry II Test 3 (Chapters 15, 16) Date: Name: Mg? (aq) + 2OH(aq) (1) Merois partially dissolved in water: Mg(OH)2 () Write the Kp expression for Mg(OH):: K = (2) Solid AgCl is partially dissolved in water: AgCl 2 Ag+ + CI'. If the molar solubility is known as (Ag +) - CI') = 1.3x 10 M. AgCI Kp = (a) 1.3 x 10 (b) 1.69 x 100 (c) 2.6 x 10% (d) none of these (3) At 25 °C, the solubility of solid AgCl in a solution containing Agt should be _ its solubility in pure water. (a) greater than (b) less than (c) the same as .PbCl, solid has Kp = 1.7 x 10, which one has larger (4) CaF, solid has Kp = 3.9 x 10 solubility in water? (a) CaF; (b) PbCI: (c) Both are the same (5) Solid MgCO3 is slightly dissolved in water : MgCO, (s) = Mg 2+ (aq) + CO, (aq). The solubility product of MgCO, is: Kp = 3.5 x 10", the molar solubility of MgCO, i.e. (Mg) or (COP) is (a) 3.5 x 10M (b) 1.75 x 10M (c) 10 M (d) 1.87 x 10"M (6) ZnS solid has Ksp = 2x 10. CuS solid has Ksp = 6x 10", when very slowly adding HS gas to 0.1 M (Zn) and 0.1 M (Cu) solution, which solid will precipitates first? (a) Zns (b) Cus (c) at the same time (7) When a liquid freezes to become solid, the entropy change of the system (a) AS sys > 0 (b) AS sys <0 (c) AS sy = 0 (d) AS sys = AG (8) When liquid is vaporized to become gas, the entropy change of the system (a) AS > 0 (b) AS <0 (c) AS = 0 (d) AS = AG

Answer 1

MaCOH)=EMa2J COH )&T Ksp soeSi1 Agci(s) Agt (aa)+ crfaa) solubililey [Ag +] CL Kap = CACe 1:7 Ksp =LAgt1 Ea since LAgt] L LA912=3xlO-S M Ksp IAgt] (h3x10-5)2 LAgt 0.00360 M Solubility el Ag e Solubility o Agei CAgt] -0.00360M Option D' is Ceoect, (None gl these)