Ammonium sulfate
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| Ammonium sulfate | |
|---|---|
|
| |
| General | |
| Systematic name | ? |
| Other names | ? |
| Molecular formula | ? |
| SMILES | ? |
| Molar mass | 132.14 g/mol |
| Appearance | fine white granules or crystals. |
| CAS number | [?-?-?] |
| Properties | |
| Density and phase | 1.77 g/cm3 @ 50 °C (122 °F), ? |
| Solubility in water | appreciable in water, 41.22 g/100 g water @ 25 °C (77 °F) |
| Melting point | 235 to 280 °C (455 to 536 °F) decomposes. |
| Boiling point | not applicable. |
| Acidity (pKa) | ? |
| Basicity (pKb) | ? |
| Chiral rotation | ?° |
| Viscosity | ? cP at ?°C |
| Structure | |
| Molecular shape | ? |
| Coordination geometry | ? |
| Crystal structure | ? |
| Dipole moment | ? D |
| Hazards | |
| MSDS | External MSDS |
| Main hazards | ? |
| NFPA 704 | |
| Flash point | ?°C |
| R/S statement | R: ? S: ? |
| RTECS number | ? |
| Supplementary data page | |
| Structure and properties | n, εr, etc. |
| Thermodynamic data | Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Other anions | ? |
| Other cations | ? |
| Related ? | ? |
| Related compounds | ? |
| Except where noted otherwise, data are given for materials in their standard state (at 25°C, 100 kPa) [Chemical infoboxInfobox disclaimer and references] | |
Ammonium sulfate, (NH4)2SO4, sometimes known as Mohrs Salt, is a chemical compound commonly used as a fertilizer. Ammonium sulfate is quite acidic and will lower the pH balance of the soil as well as other sulfate compounds such as aluminium sulfate. Ammonium sulfate contains 21% nitrogen as ammonia and 18% sulfur as sulfur tetraoxide.
Ammonium sulfate is not soluble in alcohol or liquid ammonia, but is highly hygroscopic and spontaneously absorbs water from the air at relative humidity > 81%. Ammonium sulfate is prepared commercially by reacting ammonia with sulfuric acid (H2SO4). In the soil the SO4 is released and forms sulfuric acid and the ammonia contributes nitrogen.
Ammonium sulfate is prepared commercially from the ammoniacal liquor of gas-works and is purified by recrystallization. It forms large rhombic prisms, has a somewhat saline taste and is easily soluble in water. The aqueous solution on boiling loses some ammonia and forms an acid sulfate. It is used largely as an artificial manure, and also for the preparation of other ammonium salts. It is also a component of the ABC powder in some dry powder fire extinguishers.
In biochemistry, ammonium sulfate precipitation is a common method for concentrating proteins.
External links
- For a full list of external links to MSDSs, spectroscopic data, commercial chemicals suppliers etc. for this compound, see [Chemical sources].
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