Inorganic cations often can be removed from solutionas insoluble sulfides by

Inorganic cations often can be removed from

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42. Inorganic cations often can be removed from solutionas insoluble sulfides by adding H2S which ionizes in water to form small concentrations of S2¯(aq). What is the maximum concentration of Cu2+that can exist in a solution containing 3.0 x 10¯6M sulfide ion (Ksp(CuS) = 8.5 x 10¯45)? (A) 2.6 x 10¯50(B) 2.8 x 10¯39(C) 5.3 x 10¯20(D) 8.2 x 10¯1443. A mixture of hydrogen and nitrogen are allowed to come to equilibrium at a specific temperature according to the reaction 3 H2+ N2<===> 2 NH2Analysis of the equilibrium mixture shows that it contains 1.5 mol NH3, 2.0 mol N2, and 3.0 mol H2. How many mols of H2were present at the beginning of the reaction? 44. If the temperature is raised in an equilibrium system containing H2, N2and NH3, it is found that the equilibrium constant for the formation of NH3decreases. This indicates that the synthesis of ammonia from its elements 45. Bleaching powder reacts with iodide ion according to the following unbalanced equation: OCl¯ + I¯ + H+<===> I2+ Cl¯ + H2O A 0.6000 g sample of bleaching powder requires 35.24 mL of 0.1084 N Na2S2O3to titrate the liberated iodine. The percentage of Cl in the sample is
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46. The balanced oxidaton-reduction reaction for the following equation Hg2+(aq) + H2S(aq) ---> Hg°(s) + S8(s) (acid solution) would be (A) 16 Hg2+(aq) + 16 H2S(aq) ---> 2 S8(s) + 16 Hg°(s) + 16 H+(aq) (B) 8 Hg2+(aq) + 8 H2S(ag) ---> S8(s) + 16 Hg°(s) + 16 H+(aq) (C) 8 Hg2+(aq) + 8 H2S(aq) ---> S8(s) + 8 Hg°(s) + 8 H+(aq) (D) 8 Hg2+(aq) + 8 H2S(aq) ---> S8(s) + 8 Hg°(s) + 16 H+(aq) answers. I have decided to go with the problem statement.] [Reader's Note: Problem 46 in the original has Hg2+in the problem statement, but Hg22+in the 47. The balanced equation for the reduction of the nitrate anion by the Fe(II) ion in an acidic solution is 48. Given the following half-reactions: A2++ e¯ ---> A+E° = +1.70 V B4++ 2e¯ ---> B2+E° = +0.60 V C3++ e¯ ---> C2+E° = +0.90 V The only reaction that could be used in a titration would be 49. During a potentiometric oxidation-reduction titration, the only place at which the Ecellequals the E° of the substance being titrated is
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  • Spring '08
  • rogers
  • Atom, Reaction, Vapor pressure, uranium oxide, atomic weight, (aq)

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