Lead(II) sulfate

Lead(II) sulfate
IUPAC name lead(II) sulfate
Other names Anglesite
Identifiers
CAS number	7446-14-2 Y
ChemSpider	19956579 Y
Jmol-3D images	Image 1
SMILES [O-]S(=O)(=O)[O-].[PbH4+2]
InChI InChI=1S/H2O4S.Pb.4H/c1-5(2,3)4;;;;;/h(H2,1,2,3,4);;;;;/q;+2;;;;/p-2 Y Key: PIJPYDMVFNTHIP-UHFFFAOYSA-L Y
Properties
Molecular formula	PbSO4
Molar mass	303.26 g/mol
Appearance	white solid
Density	6.29 g/cm3[1]
Melting point	1087 °C, 1360 K[1]
Solubility in water	4.25 mg/100 mL (25 °C)
Structure
Crystal structure	orthorhombic, barite
Thermochemistry
Std enthalpy of formation ΔfHo298	–920.1 kJ/mol
Standard molar entropy So298	–813.4 kJ/mol
Specific heat capacity, C	103 J/degree mol
Hazards
EU Index	082-001-00-6
EU classification	Repr. Cat. 1/3 Toxic (T) Harmful (Xn) Dangerous for the environment (N)
R-phrases	R61, R20/22, R33, R62, R50/53
S-phrases	S53, S45, S60, S61
NFPA 704	0 3 0
Flash point	Non-flammable
Threshold Limit Value	0.15 mg/m3
Related compounds
Other anions	Lead(II) chloride, Lead(II) bromide, Lead(II) iodide, Lead(II) fluoride
Other cations	Tin(II) sulfate, Sodium sulfate, Copper(II) sulfate
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

Lead(II) sulfate (British English sulphate) (PbSO₄) is a white crystal or powder. It is also known as fast white, milk white, sulfuric acid lead salt or anglesite.

It is often seen in the plates/electrodes of car batteries, as it is formed when the battery is discharged (when the battery is recharged, then the lead sulfate is transformed back to metallic lead and sulfuric acid on the negative terminal or lead dioxide and sulfuric acid on the positive terminal). Lead sulfate is poorly soluble in water.

Toxicology

Lead sulfate is toxic by inhalation, ingestion and skin contact. It is a cumulative poison, and repeated exposure may lead to anemia, kidney damage, eyesight damage or damage to the central nervous system (especially in children). Some lead salts may cause reproductive defects and cardiovascular disturbances. It is also corrosive - contact with the eyes can lead to severe irritation or burns. Typical threshold limit value (above which the substance is harmful) is 0.15 mg/m³.

Mineral

The naturally occurring mineral anglesite, PbSO₄, occurs as an oxidation product of primary lead sulfide ore, galena.

Basic and hydrogen lead sulfates

A number of lead basic sulfates are known: PbSO₄·PbO; PbSO₄·2PbO; PbSO₄·3PbO; PbSO₄·4PbO. They are used in manufacturing of active paste for lead acid batteries. A related mineral is leadhillite, 2PbCO₃·PbSO₄·Pb(OH)₂.

At high concentration of sulfuric acid (>80%), hydrogen lead sulfate, Pb(HSO₄)₂, forms.^[2]

External links

• Case Studies in Environmental Medicine (CSEM): Lead Toxicity
• ToxFAQs: Lead
• National Pollutant Inventory - Lead and Lead Compounds Fact Sheet

References

1. ^ ^{a b} "CRC Handbook of Chemistry and Physics", 83rd Edition, CRC Press, 2002.
2. ^ Министерство образования и науки РФ, Реферат "Свинец и его свойства", 2007, http://revolution.allbest.ru/chemistry/00011389_0.html