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Lecture 92/05/07 Seminar Today
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If HCl is added slowly to a solution that is 0.10 M Pb 2+ and 0.01 M Ag +. K sp (AgCl) = 1.6 x 10 -10 K sp (PbCl 2 ) = 2.4 x 10 -4 Which precipitates first AgCl or PbCl 2 ?
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Common Ion Effect BaSO 4 (s) ⇄ Ba 2+ (aq) + SO 4 2- (aq) What happens if you add Na 2 SO 4 to the solution? What if you just started with SO 4 2- ?
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Compare the solubility of AgCl in pure water at 25˚C and the solubility of AgCl in a solution of 0.55M NaCl? K sp = 1.8 x 10 -10 at 25˚C.
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Formation of complex ions Lewis acid + Lewis base Metal ions can act as a Lewis acid Examples of Lewis bases NH 3 CN - S 2 O 3 2- SCN -
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Complex ions Ag + (aq) + 2NH 3 (aq) ⇄ Ag(NH 3 ) 2 + (aq)
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Complex ions and solubility What happens if you have a beaker with AgCl (s) and NH 3 ?
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