Lead(II) sulfate

Lead(II) sulfate
Lead(II) sulfate
Identifiers
CAS number 7446-14-2 YesY
ChemSpider 19956579 YesY
Jmol-3D images Image 1
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
NFPA 704.svg
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
 YesY (verify) (what is: YesY/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.

Contents

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

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

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