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Calcium thiosulfate (MF: CaO₃S₂ MW: 152.206) is an important inorganic compound that decomposes upon contact with acids, releasing sulfur, sulfur dioxide, and calcium sulfate. It exhibits reductive properties and can react with certain metal ions to form complexes. Its aqueous solution is weakly alkaline, hydrolyzing to yield small amounts of thiosulfate and hydroxide ions.
| Item | Specification |
| Melting point | ~100°C |
| Boiling point | N/A |
| Density | 1.870 |
| Solubility | Highly soluble in water; insoluble in organic solvents such as ethanol and diethyl ether. |
Calcium hyposulfite can be used to remove heavy metal ions (e.g., lead, mercury) from water and serves as a dechlorinating agent to reduce residual chlorine’s environmental impact.
Calcium hyposulfite serves as a soil conditioner, regulating soil pH while supplementing crops with sulfur and calcium to promote plant growth.
Calcium hyposulfite functions as a fixing aid in photography, can be used to manufacture other thiosulfate products, or serves as a reducing agent and bleaching aid in chemical production.
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