Thiosulfuric acid
Thiosulfuric acid is an inorganic compound with formula H2S2O3.
- 1Names
- 2Formulae and structures
- 3Properties
- 4Constituents
- 5Thermodynamic properties
- 6Solubility
- 7Preparations
- 8Chemical reactions
- 9Related substances
- 10Related categories
Names
List of substance names
- Typical name
- Thiosulfuric acid
- Compositional nomenclature
- Hydrogen thiosulfate
- Dihydrogen thiosulfate
- Additive nomenclature
- Dihydroxidooxidosulfidosulfur
- Hydrogen nomenclature
- Dihydrogen(trioxidosulfidosulfate)
- Functional replacement nomenclature
- Sulfurothioic O-acid
- IUPAC acceptable common names
- Thiosulfuric acid
Formulae and structures
List of formulae
- Typical formula
- H2S2O3
- Molecular formula
- H2S2O3
- Compositional formula
- H2S2O3
- Structural formula
- Other structural formulas
- Lewis structure
- Colored Lewis structure
Properties
List of substance properties
- Name
- Thiosulfuric acid
- Formula
- H2S2O3
- Appearance
- Colorless aqueous solution
- Odor
- Odorless
- Molar mass
- 114.13 g/mol
- Density
- –
- Melting point
- –
- Boiling point
- –
Constituents
Constituent atoms
| Atom | Name | Oxidation state | Number |
|---|---|---|---|
| H | Hydrogen | +1 | 2 |
| S | Sulfur | +5 | 1 |
| S | Sulfur | −1 | 1 |
| O | Oxygen | −2 | 3 |
Ratio of atoms
| Atom | Atomic weight | Number | Atomic ratio | Weight ratio |
|---|---|---|---|---|
| H | 1.008 | 2 | 28.57% | 1.77% |
| S | 32.06 | 2 | 28.57% | 56.18% |
| O | 15.999 | 3 | 42.86% | 42.05% |
Thermodynamic properties
Phase transition properties
- Enthalpy of fusion
- –
- Enthalpy of vaporization
- –
- Enthalpy of vaporization at 25°C
- –
- Enthalpy of other transition
- –
Solubility
Qualitative solubility
Preparations
Reaction of salt of weak acid and strong acid
The reaction of salt of weak acid and strong acid can yield thiosulfuric acid.
Decomposition
Decomposition of thermally decomposable substance can yield thiosulfuric acid.
Reaction of nonmetal and water
The reaction of and water yields thiosulfuric acid and hydrogen sulfide.
Chemical reactions
Electrolytic dissociation
Electrolytic dissociation of thiosulfuric acid yields hydrogen ion and anion.
Reaction with base
The reaction of thiosulfuric acid and base yields salt.
Reaction with basic oxide
The reaction of basic oxide and thiosulfuric acid yields salt and water.
Reaction with salt of volatile acid
The reaction of salt of volatile acid and thiosulfuric acid yields salt of non volatile acid and volatile acid.
Reaction with anion
The reaction of thiosulfuric acid and thiosulfate ion yields hydrogenthiosulfate ion.
Reaction with active metal
The reaction of and thiosulfuric acid yields salt and .
Reaction with oxidizing species
The reaction of thiosulfuric acid and oxidizing species yields a variety of products.
Reaction with reducing species
The reaction of reducing species and thiosulfuric acid yields a variety of products.
Precipitation reaction
When a certain chemical species is present in aqueous solution, it reacts with thiosulfuric acid to form a precipitate.
Electrolysis of aqueous solution
Electrolysis of aqueous thiosulfuric acid yields a variety of products.
Decomposition
Decomposition of thiosulfuric acid yields a variety of products.
