Page 1106 - Chemistry--atom first

1096 Chapter 19 | Transition Metals and Coordination Chemistry
23. Dilute sodium cyanide solution is slowly dripped into a slowly stirred silver nitrate solution. A white precipitate forms temporarily but dissolves as the addition of sodium cyanide continues. Use chemical equations to explain this observation. Silver cyanide is similar to silver chloride in its solubility.
24. Predict which will be more stable, [CrO4]2− or [WO4]2−, and explain.
25. Give the oxidation state of the metal for each of the following oxides of the first transition series. (Hint: Oxides
of formula M3O4 are examples of mixed valence compounds in which the metal ion is present in more than one oxidation state. It is possible to write these compound formulas in the equivalent format MO∙M2O3, to permit estimation of the metal’s two oxidation states.)
(a) Sc2O3
(b) TiO2
(c) V2O5
(d) CrO3
(e) MnO2
(f) Fe3O4
(g) Co3O4
(h) NiO
(i) Cu2O
19.2 Coordination Chemistry of Transition Metals
26. Indicate the coordination number for the central metal atom in each of the following coordination compounds: (a) [Pt(H2O)2Br2]
(b) [Pt(NH3)(py)(Cl)(Br)] (py = pyridine, C5H5N)
(c) [Zn(NH3)2Cl2]
(d) [Zn(NH3)(py)(Cl)(Br)]
(e) [Ni(H2O)4Cl2]
(f) [Fe(en)2(CN)2]+ (en = ethylenediamine, C2H8N2)
27. Give the coordination numbers and write the formulas for each of the following, including all isomers where appropriate:
(a) tetrahydroxozincate(II) ion (tetrahedral)
(b) hexacyanopalladate(IV) ion
(c) dichloroaurate(I) ion (note that aurum is Latin for "gold") (d) diamminedichloroplatinum(II)
(e) potassium diamminetetrachlorochromate(III)
(f) hexaamminecobalt(III) hexacyanochromate(III)
(g) dibromobis(ethylenediamine) cobalt(III) nitrate
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