Dipotassium pentasulfide
| Names | |
|---|---|
| Other names
dipotassium sulphide, potassium polysulfide
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| Identifiers | |
| Properties | |
| K2S5 | |
| Appearance | red-orange prisms |
| Structure | |
| orthorhombic | |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
Potassium pentasulfide is the inorganic compound with the formula K2S5. It is a red-orange solid that dissolves in water. The salt decomposes rapidly in air. It is one of several polysulfide salts with the general formula M2Sn, where M = Li, Na, K and n = 2, 3, 4, 5. The polysulfide salts of potassium and sodium are similar.
The salt is prepared by the addition of elemental sulfur to potassium sulfide. An idealized equation is shown for potassium hydrosulfide:
The structure consists of zigzag chains of S52− linked to K+ ions.
Various polysulfides K2S2 - K2S6 are components of liver of sulfur. Polysulfides, like sulfides, can induce stress corrosion cracking in carbon steel and stainless steel.
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