Lead(II) nitrate
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| Names | |
|---|---|
| IUPAC name
Lead(II) nitrate
| |
| Other names
Lead dinitrate
Lead nitrate Plumb dulcis Plumbous nitrate | |
| Properties | |
| Pb(NO3)2 | |
| Molar mass | 331.2 g/mol |
| Appearance | White solid |
| Density | 4.53 g/cm3 (20 °C) |
| Melting point | 470 °C (878 °F; 743 K) (decomposes) |
| Boiling point | Decomposes |
| 37.65 g/100 ml (0 °C) 59.7 g/100 ml (25 °C) 127 g/100 ml (100 °C) | |
| Solubility | Insoluble in conc. nitric acid |
| Solubility in ethanol | 0.04 g/100 ml |
| Solubility in methanol | 1.3 g/100 ml |
| Vapor pressure | ~0 mmHg |
| Hazards | |
| Safety data sheet | Sigma-Aldrich |
| Flash point | Non-flammable |
| Related compounds | |
| Related compounds
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Lead(II) acetate Lead(II) azide |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Lead(II) nitrate is the inorganic compound with chemical formula Pb(NO3)2, and is one of the few examples of a water-soluble lead compound, though it's not as often used due to its tendency to hydrolyze in neutral conditions.
Contents
Properties
Chemical
Lead nitrate is prone to partial hydrolysis in water, giving neutral solutions a cloudy appearance. This can be rectified by the addition of a small amount of nitric acid to the solution. Given that lead nitrate is the most commonly encountered water-soluble lead salt, it is an important precursor to other insoluble lead compounds.
Lead oxide can be used in flash powders, but this is rarely done, as the combustion releases airborne particles of toxic lead oxide.
Physical
Lead nitrate generally appears as colorless or white crystals or powder, often with a dusty-looking outer surface. Lead nitrate is one of very few compounds of lead that is soluble in water. Even so, it is difficult to dissolve, often requiring a lot of stirring or heating to finally enter solution. It tends to slightly hydrolyze in neutral solutions, usually a small amount of nitric acid is added to keep all the compound dissolved.
Availability
Due to the high toxicity of lead compounds, especially those that are water-soluble, it is unlikely that lead nitrate has any over-the-counter sources. Lead metal, however, is easily obtainable and can be used to produce it if nitric acid is available.
Preparation
Lead nitrate is slowly formed by the reaction between nitric acid and lead metal, and can also be produced at a much faster rate and in better yield by dissolving lead oxides or lead hydroxide/carbonate in nitric acid.
- 3 Pb + 8 HNO3 → 3 Pb(NO3)2 + 2 NO + 4 H2O
- PbO + 2 HNO3 → Pb(NO3)2 + H2O
- Pb(OH)2 + 2 HNO3 → Pb(NO3)2 + 2 H2O
- PbCO3 + 2 HNO3 → Pb(NO3)2 + H2O + CO2
An excess amount of acid is used to prevent hydrolysis. The compound is extracted via recrystallization.
Projects
- Make the bright yellow pigment chrome yellow (lead(II) chromate)
- Make lead dioxide (for Ti/PbO2 electrode)
- Make lead(II) azide
Handling
Safety
Lead nitrate, like other lead compounds, is highly toxic and is a cumulative poison that accumulates in the body. Being water-soluble, it is even more so, and should always be handled with gloves and skin protection, and the very strictest of measures should be taken to prevent its ingestion.
Storage
Lead nitrate is relatively unreactive and can be stored almost indefinitely, preferably in a labeled, difficult-to-open container to avoid accidental poisonings. However it is somewhat sensitive to water over time, so it's best to store it in a dry sealed container.
It is much more stable in solution, with a small amount of nitric acid added.
Disposal
All water-soluble lead salts should be dissolved in water and converted to lead carbonate or oxides, which are safer to handle. If the lead must be gotten rid of, these insoluble compounds should be taken to a facility that processes hazardous wastes.
