Complexes_S2008_L2 - 1 Quiz Quiz Will copper metal displace...

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Unformatted text preview: 1 Quiz Quiz Will copper metal displace silver ions from an aqueous solution as indicated below? 2+ 2+ Re : (1 ) ( ) 0.800 : Cu(s) Cu (1M) 2e 0.337 : Cu(s) 2 (1 ) Cu (1M) 2 ( ) o red o red duction Ag M e Ag s E V Oxidation E V Net Ag M Ag s + − − + + → = → + = + → + 2 ( ) 2 (1 ) (1 ) 2 ( ) Cu s Ag M C u M A g s + + + → + cell cathode anode E E E = − 0.800 V (0.337) V 0.463 cell o cell E G n F E = Δ = − 2 Quiz Quiz Calculate K eq at 25 o C for the reaction 2+ 2+ Re : (1 ) ( ) 0.800 : Cu(s) Cu (1M) 2e 0.337 : Cu(s) 2 (1 ) Cu (1M) 2 ( ) o red o red duction Ag M e Ag s E V Oxidation E V Net Ag M Ag s + − − + + → = → + = + → + 2 ( ) 2 (1 ) (1 ) 2 ( ) Cu s Ag M C u M A g s + + + → + cell cathode anode E E E = − 0.463 cell E = 15.6 15 2.303 log 2 0.463 log 15.6 2.303 0.0592 10 4 10 eq cell cell eq eq RT K E nF nF E K RT K = × × = = = × = = × 3 Chelates Chelates [Ni(H 2 O) 6 ] 2+ ( aq ) + 6NH 3 [Ni(NH 3 ) 6 ] 2+ ( aq ) + 6H 2 O( l ) K f = 4 × 10 8 [Ni(H 2 O) 6 ] 2+ ( aq ) + 3en [Ni(en) 3 ] 2+ ( aq ) + 6H 2 O( l ) K f = 2 × 10 18 • Sequestering agents are chelating agents that are used to remove unwanted metal ions. • In medicine sequestering agents are used to selectively remove In medicine sequestering agents are used to selectively remove toxic metal ions (e.g. Hg toxic metal ions (e.g. Hg 2+ 2+ and Pb and Pb 2+ 2+ ) while leaving biologically ) while leaving biologically important metals. important metals. • One very important chelating agent is ethylenediaminetetraacetate (EDTA 4- ). 4 Chelates Chelates • EDTA occupies 6 coordination sites, for example [CoEDTA]- is an octahedral Co 3+ complex. • Both N atoms (blue) and O atoms (red) coordinate to the metal. • EDTA is used in consumer products to complex the metal ions which catalyze decomposition reactions. 5 Nomenclature Nomenclature penta 5 hexa 6 tetra 4 tri 3 di 2 • Charge on complex ion = charge on metal + charges on ligands. 6 Nomenclature Nomenclature penta 5 hexa 6 tetra 4 tri 3 di 2 • Charge on complex ion = charge on metal + charges on ligands. [Co(NH 3 ) 5 Cl]Cl 2 • How many ligands of each type? • Oxidation state of metal ion? [Co(NH 3 ) 5 Cl] 2+ + 2Cl- X + 5(0) -1 = +2 X = +3 Important Important 7 Nomenclature Nomenclature • Rules: – For salts, name the cation before the anion. Example in [Co(NH 3 ) 5 Cl]Cl 2 we name [Co(NH 3 ) 5 Cl] 2+ before Cl- ....
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