Complexes_S2008_L2

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

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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- ....
View Full Document

This note was uploaded on 04/28/2008 for the course CHEM 132 taught by Professor Laceyandhanson during the Spring '08 term at SUNY Stony Brook.

Page1 / 13

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

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online