1.Given the following standard reduction potentials, Ag^+(aq) + e^- --> Ag(s) Eo

ID: 783402 • Letter: 1

Question

1.Given the following standard reduction potentials,

Ag^+(aq) + e^- --> Ag(s) Eo=0.80V

AgCN(s) + e^- --> Ag(s) + CN^-(aq) Eo=-0.01V

Calculate the solubility product of AgCN at 25oC

a) 4.3 x 10^-14

b) 2.3 x 10^13

c)2.1 x 10^-14

d)5.1 x 10^13

e)None of these

2. Which one of these metals would normally be obtained by electrolytic reduction?

a)aluminum

b)chromium

c)copper

d)iron

e)zinc

3. The correct formula for sodium tetracyanonickelate(II) ion is:

a) Ni(CN)4

b) [Ni(CN)4]+

c) [Ni(CN)4]2+

d) [Ni(CN)4]-

e) [NI(CN)4]2-

4. Which of the following complexes has optical (chiral) isomers?

a) [Co(H2O)4Br2]+

b) [Co(en)Cl4]-

c) [Co(en)(H2O)4]3+

d) [Co(en)2Cl2]+

e) Co(H2O)3Cl3

Please show work!!

1) (C)

%u0394G = -RTlnK and

%u0394G = -nFE and
so
nFE = RTlnK

lnK = nFE/RT = 1mole e- x 9.65E4J/V x -.81V / (8.31J/moleK x 298K) = -31.6
K = e^-31.6 = 2.1E-14

2) e)zinc

3) d) [Ni(CN)4]-

4) a) [Co(H2O)4Br2]+

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