In concentrated solutions and on addition of base, polymeric ions that contain3, 4, and 6 Pb atoms are formed. The crystalline “basic” salt
[Pb6O(OH)6]4+(ClO4-)4∙H2O
has the cluster structure in Fig. 15-2. The O atom lies at the center of the middle tetrahedron, while the OH groups lie on the faces of the outer tetrahedral.
Figure 15-2 The three face-sharing tetrahedral of Pb atoms in the Pb6O(OH)64+ cluster.
Addition of more base eventually gives the hydrous oxide which dissolves in excess to give the plumbate ion.
Most lead salts are only sparingly soluble in water and some, for example, PbSO4 or PbCrO4, are insoluble. The common soluble salts are Pb(NO3)2 and Pb(CO2Me)2∙H2O, which is incompletely ionized in water. The halides are always anhydrous and in solution form complex species PbX+, PbX3-, etc., except for the fluoride where only PbF+ occurs.
Study Questions
1.Why is CO2 a gas and SiO2 a giant molecule?
2.Explain what is meant by dπ−pπ bonding.
3. Why does tin from divalent compounds more easily than silicon?
4. How is super pure Ge made GeO2?
5.Write balanced equations for the synthesis of SiH4 and its hydrolysis aqueous NaOH
6. Why is CCl4 unreactive to H2O whereas SiCl4 is rapidly hydrolyzed?
7. Draw structures for (a) a cyclic silicate anion (b) a pyroxene (c) an asbestos.
8.Explain the nature of zeolites and molecular Sieves.
9.Why is SiF4 incompletely hydrolyzed in water?
10.Why does Si have much less tendency to form bonds to itself than does C ?
11. How is lead tetraacetate made?
12. What is red lead?
13. What is the nature of SnII in chloride solution?
14. What is the nature of basic tin and lead salts?
15. How would you recover Ge from a spent petroleum re-forming catalyst comprised of 1% Pt—Ge alloy on alumina?
16. What is the structure of SiC?
In concentrated solutions and on addition of base, polymeric ions that contain3, 4, and 6 Pb atoms are formed. The crystalline “basic” salt
[Pb6O(OH)6]4+(ClO4-)4∙H2O
has the cluster structure in Fig. 15-2. The O atom lies at the center of the middle tetrahedron, while the OH groups lie on the faces of the outer tetrahedral.
Figure 15-2 The three face-sharing tetrahedral of Pb atoms in the Pb6O(OH)64+ cluster.
Addition of more base eventually gives the hydrous oxide which dissolves in excess to give the plumbate ion.
Most lead salts are only sparingly soluble in water and some, for example, PbSO4 or PbCrO4, are insoluble. The common soluble salts are Pb(NO3)2 and Pb(CO2Me)2∙H2O, which is incompletely ionized in water. The halides are always anhydrous and in solution form complex species PbX+, PbX3-, etc., except for the fluoride where only PbF+ occurs.
Study Questions
1.Why is CO2 a gas and SiO2 a giant molecule?
2.Explain what is meant by dπ−pπ bonding.
3. Why does tin from divalent compounds more easily than silicon?
4. How is super pure Ge made GeO2?
5.Write balanced equations for the synthesis of SiH4 and its hydrolysis aqueous NaOH
6. Why is CCl4 unreactive to H2O whereas SiCl4 is rapidly hydrolyzed?
7. Draw structures for (a) a cyclic silicate anion (b) a pyroxene (c) an asbestos.
8.Explain the nature of zeolites and molecular Sieves.
9.Why is SiF4 incompletely hydrolyzed in water?
10.Why does Si have much less tendency to form bonds to itself than does C ?
11. How is lead tetraacetate made?
12. What is red lead?
13. What is the nature of SnII in chloride solution?
14. What is the nature of basic tin and lead salts?
15. How would you recover Ge from a spent petroleum re-forming catalyst comprised of 1% Pt—Ge alloy on alumina?
16. What is the structure of SiC?
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