Ch.17 - Applications of Aqueous Equilibria
Chapter 17, Problem 136
Using the qualitative analysis flowchart in Figure 17.18
, tell how you could separate the following pairs of ions. (a) Ag+ and Cu2+Verified Solution
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Textbook Question
Citric acid (H3Cit) can be used as a household cleaning agent to dissolve rust stains. The rust, represented as Fe(OH)3, dissolves because the citrate ion forms a soluble complex with Fe3+
(a) Using the equilibrium constants in Appendix C and Kf = 6.3 x 10^11 for Fe(Cit), calculate the equilibrium constant K for the reaction.
(b) Calculate the molar solubility of Fe(OH)3 in 0.500 M solution of H3Cit.
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Textbook Question
Can Fe2+ be separated from Sn2+ by bubbling H2S through a 0.3 M HCl solution that contains 0.01 M Fe2+ and 0.01 M Sn2+? A saturated solution of H2S has [H2S] ≈ 0.10 M. Values of Kspa are 6 x 10^2 for FeS andd 1 x 10^-5 for SnS.
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Textbook Question
Will FeS precipitate in a solution that is 0.10 M in Fe(NO3)2, 0.4 M in HCl, and 0.10 M in H2S? Will FeS precipitate if the pH of the solution is adjusted to pH 8 with an NH4+ - NH3 buffer? Kspa = 6 x 10^2 for FeS.
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Textbook Question
Give a method for seperating the following pairs of ions by the addition of no more than two substances.
(a) Hg2+ and Co2+
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Textbook Question
Assume that you have three white solids: NaCl, KCl, and MgCl2. What tests could you do to tell which is which?
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Textbook Question
In quantitative analysis, Ag+, Hg2+, and Pb2+ are seperated from other cations by the addition of HCl. Calculate the concentration of Cl-ions required to just begin the precipitation of (a) AgCl, (b) Hg2Cl2, (c) PbCl2 in a solution hav-ing metal-ion concentrations of 0.030 M. What fraction of the Pb2+ remains in solution when the Ag+ just begins to precipitate?
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