3D model (JSmol)
|Molar mass||110.22 g/mol|
|Appearance||red, oily liquid|
|Melting point||−26.8 °C; −16.3 °F; 246.3 K|
|Boiling point||58 °C; 136 °F; 331 K|
|Carbonic acid, Thiosulfuric acid|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Thiocarbonic acid is an inorganic acid which is related to carbonic acid. It is an unstable red oil with the chemical formula H2CS3. It is often referred to as trithiocarbonic acid so as to differentiate it from other thiocarbonates.
Discovery and synthesis
It was first reported in brief by Zeise in 1824 and later in more detail by Berzelius in 1826, in both cases it was produced by the action of carbon disulfide on a hydrosulfide salt (e.g. potassium hydrosulfide).
- CS2 + 2 KSH → K2CS3 + H2S
Treatment with acids liberates the thiocarbonic acid as a red oil
- K2CS3 + 2 HX → H2CS3 + 2 KX
Both the acid and many of its salts are unstable and decompose via the release of carbon disulfide, particularly upon heating:
- H2CS3 → CS2 + H2S
- Berzelius, J. J. (1826). "Ueber die Schwefelsalze" [About the sulfur salts]. Annalen der Physik (in German). 82 (4): 425–458. doi:10.1002/andp.18260820404.
- O'Donoghue, Ida Guinevere; Kahan, Zelda (1906). "CLXXIV.—Thiocarbonic acid and some of its salts". J. Chem. Soc., Trans. 89 (0): 1812–1818. doi:10.1039/CT9068901812.