L22_Solub3_115b08

L22_Solub3_115b08 - L22: Solubility: the greatest amount...

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L22: Solubility: the greatest amount that will dissolve in a specified volume of a solvent at particular conditions (T, pH, presence of other ions, etc). Solubility product: equilibrium constant For an ionic solid A n B m : A n B m (s) <−> nA +x (aq) + mB -y (aq) K sp =[A +x ] n [B -y ] m Le Chatelier principle pH Effects Common ion effect Selective precipitation TODAY Increasing solubility by complex ions
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Tornado demo: Hg(NO 3 ) 2 + KI 1. Hg 2+ (aq) + 2I - (aq)<-> HgI 2 (s) K sp =[Hg 2+ ][I - ] 2 =10 -4 2. HgI 2 (s) + 2I - (aq) <-> HgI 4 2- (aq) 80 ] [ ] [ 2 2 4 = = I HgI K Complex ions A metal ion surrounded by a group of compounds called ligands. Ligands (neutral or ionic) are bound to metal cation by partially covalent bonds; metal ion = Lewis acid; Ligand = Lewis base. Metal+ligand ion is bound to ion of opposite charge by ionic bond Metal+ligand ion is a different chemical than metal cation. Complex ion formation and solubility
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Tornado demo: Hg(NO 3 ) 2 + KI 1. Hg 2+ (aq) + 2I - (aq)<-> HgI 2 (s) 2. HgI 2 (s) + 2I - (aq) <-> HgI 4 2- (aq) examples: HgI 4 2- = [HgI 2 ] 0 I 2 2- [Cu(NH 3 ) 4 ] 2+ Cl 2 2- ,
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L22_Solub3_115b08 - L22: Solubility: the greatest amount...

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