Lead(II) hydroxide

Lead(II) hydroxide
	IUPAC name Lead(II) hydroxide
	Other names lead hydroxide; plumbous hydroxide
Identifiers
CAS number	19781-14-3
PubChem	9859601
ChemSpider	8035300
Jmol-3D images	Image 1
	SMILES [OH-].[OH-].[Pb+2] ;
	InChI InChI=1S/2H2O.Pb/h21H2;/q;;+2/p-2 ; Key: VNZYIVBHUDKWEO-UHFFFAOYSA-L InChI=1/2H2O.Pb/h21H2;/q;;+2/p-2; Key: VNZYIVBHUDKWEO-NUQVWONBAE ;
Properties
Molecular formula	Pb(OH)2
Molar mass	241.21 g/mol
Appearance	white amorphous powder
Density	7.41 g/cm3
Melting point	135 °C (decomp)
Solubility in water	1.55 g/100 mL (20 °C)
Solubility product, Ksp	1.42 x 10-20
Solubility	soluble in dilute acid and alkalis;; insoluble in acetone and acetic acid
Hazards
EU classification	Toxic (T)
R-phrases	R25
S-phrases	(S1/2) S20/21 S29/56 S45
NFPA 704	0 2 0
	(verify) (what is: /?); Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
	Infobox references

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Lead(II) hydroxide, Pb(OH)₂, is a hydroxide of lead, with lead in oxidation state +2. Although it appears a fundamentally simple compound, it is doubtful if lead hydroxide is stable as a solid phase.^[2] Lead basic carbonate (PbCO₃·2Pb(OH)₂) or lead(II) oxide (PbO) is encountered in practice where lead hydroxide is expected. This has been a subject of considerable confusion in the past.

When an alkali hydroxide is added to a solution of a lead(II) salt, then a hydrated lead oxide PbO·xH₂O (with x < 1) is obtained. Careful hydrolysis of lead(II) acetate solution yields a crystalline product with a formula 6PbO·2H₂O = Pb₆O₄(OH)₄.^[3]

In solution, lead(II) hydroxide is a somewhat weak base, forming lead(II) ion, Pb²⁺, under weakly acidic conditions. This cation hydrolyzes and, under progressively increasing alkaline conditions, forms Pb(OH)⁺, Pb(OH)₂(aqueous), Pb(OH)₃⁻, and other species, including several polynuclear species, e.g., Pb₄(OH)₄⁴⁺, Pb₃(OH)₄²⁺, Pb₆O(OH)₆⁴⁺.^[3]

[edit] References

^ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0070494398
^ G. Todd and E. Parry (1964). "Character of Lead Hydroxide and Basic Lead Carbonate". Nature 202 (4930): 386–387. doi:10.1038/202386a0.
^ ^a ^b Von Egon Wiberg, Nils Wiberg, Arnold Frederick Holleman, "Inorganic Chemistry", Academic Press, 2001 (Google books).

[edit] External links

[0] Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0070494398

[1] G. Todd and E. Parry (1964). "Character of Lead Hydroxide and Basic Lead Carbonate". Nature 202 (4930): 386–387. doi:10.1038/202386a0.

[H-2] Von Egon Wiberg, Nils Wiberg, Arnold Frederick Holleman, "Inorganic Chemistry", Academic Press, 2001 (Google books).

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Lead(II) hydroxide

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Lead(II) hydroxide

IUPAC name Lead(II) hydroxide
Other names lead hydroxide plumbous hydroxide
Identifiers
CAS number	19781-14-3^Y
PubChem	9859601
ChemSpider	8035300^Y
Jmol-3D images	Image 1
SMILES [OH-].[OH-].[Pb+2]
InChI InChI=1S/2H2O.Pb/h21H2;/q;;+2/p-2^Y Key: VNZYIVBHUDKWEO-UHFFFAOYSA-L^Y InChI=1/2H2O.Pb/h21H2;/q;;+2/p-2 Key: VNZYIVBHUDKWEO-NUQVWONBAE
Properties
Molecular formula	Pb(OH)₂
Molar mass	241.21 g/mol
Appearance	white amorphous powder
Density	7.41 g/cm³ ^[1]
Melting point	135 °C (decomp)
Solubility in water	1.55 g/100 mL (20 °C)
Solubility product, K_sp	1.42 x 10^-20
Solubility	soluble in dilute acid and alkalis; insoluble in acetone and acetic acid
Hazards
EU classification	Toxic (T)
R-phrases	R25
S-phrases	(S1/2) S20/21 S29/56 S45
NFPA 704	0 2 0
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references