Ammonium thiosulfate
Ammonium thiosulfate is an inorganic compound with formula (NH4)2S2O3.
- 1Names
- 2Formulae and structures
- 3Properties
- 4Constituents
- 5Thermodynamic properties
- 6Solubility
- 7Preparations
- 8Chemical reactions
- 9References
- 10Related substances
- 11Related categories
Names
List of substance names
- Typical name
- Ammonium thiosulfate
- Compositional nomenclature
- Ammonium thiosulfate
- Diammonium thiosulfate
- Substitutive nomenclature
- Azanium thiosulfate
- Additive nomenclature
- Diammonium trioxidosulfidosulfate(2−)
- Functional replacement nomenclature
- Ammonium sulfurothioate
- IUPAC acceptable common names
- Ammonium thiosulfate
Formulae and structures
List of formulae
- Typical formula
- (NH4)2S2O3
- Compositional formula
- (NH4)2S2O3
- Structural formula
- Other structural formulas
- Lewis structure
- Colored Lewis structure
Properties
List of substance properties
Constituents
Constituent ions
| Ion | Name | Charge number | Number |
|---|---|---|---|
| NH4+ | Ammonium ion | 1 | 2 |
| S2O32− | Thiosulfate ion | -2 | 1 |
Constituent atoms
| Atom | Name | Oxidation state | Number |
|---|---|---|---|
| N | Nitrogen | −3 | 2 |
| H | Hydrogen | +1 | 8 |
| S | Sulfur | +5 | 1 |
| S | Sulfur | −1 | 1 |
| O | Oxygen | −2 | 3 |
Ratio of atoms
| Atom | Atomic weight | Number | Atomic ratio | Weight ratio |
|---|---|---|---|---|
| N | 14.007 | 2 | 13.33% | 18.90% |
| H | 1.008 | 8 | 53.33% | 5.44% |
| S | 32.06 | 2 | 13.33% | 43.27% |
| O | 15.999 | 3 | 20.00% | 32.39% |
Thermodynamic properties
Phase transition properties
- Enthalpy of fusion
- –
- Enthalpy of vaporization
- –
- Enthalpy of vaporization at 25°C
- –
- Enthalpy of other transition
- –
Standard thermodynamic properties
State | Standard enthalpy of formation ΔfH° kJ · mol−1 | Standard Gibbs energy of formation ΔfG° kJ · mol−1 | Standard molar entropy S° J · K−1 · mol−1 | Standard molar heat capacity at constant pressure Cp° J · K−1 · mol−1 |
|---|---|---|---|---|
| Aqueous solution | −917.1[2] | – | – | – |
Solubility
Qualitative solubility
Solubility in water (g/100 g)[1]
| 15°C |
|---|
| 2.15 |
Solubility curve (g/100 g)
Preparations
Reaction of acid and base
The reaction of thiosulfuric acid and ammonia yields ammonium thiosulfate.
Reaction of nonmetal, base, and water
The reaction of , ammonia, and water yields ammonium thiosulfate and ammonium sulfide.
Decomposition
Decomposition of thermally decomposable substance can yield ammonium thiosulfate.
Chemical reactions
Electrolytic dissociation
Electrolytic dissociation of ammonium thiosulfate yields ammonium ion and thiosulfate ion.
Reaction with strong acid
The reaction of ammonium thiosulfate and strong acid yields salt of strong acid and thiosulfuric acid.
Reaction with strong base
The reaction of ammonium thiosulfate and strong base yields salt of strong base, ammonia, and water.
Reaction with nonvolatile base
The reaction of ammonium thiosulfate and barium hydroxide yields barium thiosulfate, ammonia, and water.
Reaction with oxidizing species
The reaction of ammonium thiosulfate and oxidizing species yields a variety of products.
Reaction with reducible species
The reaction of ammonium thiosulfate and reducible species yields a variety of products.
Reaction with reducing species
The reaction of reducing species and ammonium thiosulfate yields a variety of products.
Precipitation reaction
When a certain chemical species is present in aqueous solution, it reacts with ammonium thiosulfate to form a precipitate.
Decomposition
Decomposition of ammonium thiosulfate yields ammonia and thiosulfuric acid.
Electrolysis of aqueous solution
Electrolysis of aqueous ammonium thiosulfate yields a variety of products.
References
List of references
- 1James G. Speight (2017)Lange's Handbook of Chemistry, 17th editionMcGraw Hill Education
- 2Janiel J. Reed (1989)The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI UnitsNational Institute of Standards and Technology (NIST)
