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Potassium thiosulfate (MF: H₃KO₃S₂ MW: 154.24) is an inorganic compound belonging to the thiosulfate class. It is a derivative of potassium sulfate (K₂SO₄) where one oxygen atom is replaced by a sulfur atom. It exhibits strong reducing properties, reacting with oxidizing agents such as chlorine and iodine, and forming stable complexes with metal ions like silver and copper. It is stable in dry air but readily caking when exposed to moisture; it decomposes upon heating to approximately 100°C.
| Item | Specification |
| Appearance | White powder |
| Density | 1.484 g/mL at 25°C |
| Solubility | Highly soluble in water, forming a weakly alkaline aqueous solution; insoluble in organic solvents such as ethanol and diethyl ether. |
| Stability | Stable, incompatible with strong acids and strong oxidizing agents. |
In photography, it acts as a fixer, reacting with unexposed silver bromide on photographic film or paper to form water-soluble complexes, thereby “fixing” the image.
Used in electroplating solutions or as a cleaner/passivator for metal surfaces, it removes impurities by complexing metal ions, enhancing surface quality.
Used in small quantities as a sulfur or potassium fertilizer supplement for crops, or to mitigate heavy metal toxicity (e.g., copper, mercury) in soil by chelating heavy metal ions.
Serves as a reducing agent or chelating agent in laboratory procedures such as iodometric titration and quantitative metal ion analysis.
Used as a dechlorinating agent after bleaching in the textile industry, or as an auxiliary component in depilating agents for leather processing.
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