45 oh aq h aq h2o l 4s3 12 x 10 11 lower oh increase

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Unformatted text preview: lubility Insoluble base: remove add Mg(OH)2 (s) Mg2+ (aq) + 2OH- (aq) Ksp = [Mg2+][OH-]2 = 1.2 x 10-11 Ksp = (s)(2s)2 = 4s3 At pH less than 10.45 OH- (aq) + H+ (aq) H2O (l) 4s3 = 1.2 x 10-11 Lower [OH-] Increase solubility of Mg(OH)2 s = 1.4 x 10-4 M At pH greater than 10.45 [OH-] = 2s = 2.8 x 10-4 M Raise [OH-] Decrease solubility of Mg(OH)2 pOH = 3.55 pH = 10.45 Insoluble bases dissolve in acidic solutions acidic Factors That Affect Solubility (3) Formation of Complex Ions e-pair acceptor CoCl24 e pair donor Co 2+ (aq) + 4Cl − (aq ) Lewis Acid Co(H2O)2+ 6 [CoCl4 ]2− (aq ) lewis base Complex 2− [CoCl4 ] 1 Kf = = 2+ −4 [Co ][Cl ] Kd Kf stability of complex Complex formation constant or stability constant (Kf ) : stability the the equilibrium constant for the complex ion formation. Formation Formation Constant of Complex Ions: Kf [ Ag ( NH 3 ) 2 ]+ Kf = = 1.5 × 107 [ Ag + ][ NH 3 ]2 Metal Ion Complex Metal Metal Ion Complex Formation: Lewis Acid-Base Reaction AcidElectron Electron pair acceptor acceptor Electron pair donor donor 6H 3 N: + [Co( NH 3 )6 ]3− Co3+ lewis lewis base lewis acid complex 3+ [Co( NH 3 )6 ] Kf = 3+ 6 [Co ][ NH 3 ] Factors That Affect Solubility (3) Formation of Complex Ions • The addition of ammonia (NH3) to AgCl: ammonia AgCl ( s ) Ag + (aq ) + Cl − (aq ) + 2NH 3 (aq ) AgCl(s) more AgCl(s) is more soluble...
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This document was uploaded on 02/26/2014.

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