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Lec22notes
Course: CHEM 132, Fall 2008School: Montana
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of Effect Complex Ion Formation on Solubility Metal ions exist in aqueous solution as complex ions. For example, Fe2+(aq) is the Fe(H2O)62+ complex ion in in aqueous solution: Fe2+ + 6 H2O Fe(H2O)62+ Cu(NH3)42+ : The formation of complex ions can affect the solubility of "insoluble" salts. For example, adding NH3 to AgCl (s) causes the AgCl to dissolve: AgCl (s) + 2NH3 Ag(NH3)2+ + Cl Can...
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of Effect Complex Ion Formation on Solubility Metal ions exist in aqueous solution as complex ions. For example, Fe2+(aq) is the Fe(H2O)62+ complex ion in in aqueous solution: Fe2+ + 6 H2O Fe(H2O)62+
Cu(NH3)42+ :
The formation of complex ions can affect the solubility of "insoluble" salts. For example, adding NH3 to AgCl (s) causes the AgCl to dissolve: AgCl (s) + 2NH3 Ag(NH3)2+ + Cl Can view as a 2 step process: 1. 2. AgCl (s) Ag+ + Cl Ksp = 1.8 x 10-10 Kf = 1.7 x 107 Ag+ + 2NH3 Ag(NH3)2+
Ag+ is removed from reaction 1 by complexation with NH3. The reaction shifts right to replace the Ag+ - more AgCl dissolves. Kf : formation equilibrium constant for Ag(NH3)2+
Example: 1. AgBr (s) emulsions are used in photographic film. The "fixer" solution used in the development process dissolves excess in AgBr the exposed film by complexation of Ag+ with S2O32 to form Ag(S2O3)23- . What is the equilibrium constant for the overall reaction when a solution of S2O32 dissolves AgBr? AgBr(s) : Ksp = 5.4 x 10-13 Ag(S2O3)23- : Kf = 2.0 x 1013
Complexing agents, such as NH3, form strong complexes with transition metal ions (Main group metal ions are not complexed strongly by ammonia). 2. How would the addition of NH3 affect the solubility of: NiCO3 BaSO4 AgI
Selective Precipitation A solutio...
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