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Ammonium thiosulfate (MF: H8N2O3S2 MW: 148.21) is an inorganic compound, a salt composed of ammonium ions (NH₄⁺) and thiosulfate ions (S₂O₃²⁻). It decomposes readily upon heating, yielding ammonia gas, sulfur dioxide, and elemental sulfur. It reacts rapidly with acids, releasing sulfur dioxide gas and precipitating elemental sulfur. Possessing reductive properties, it reacts with oxidizing agents such as chlorine and bromine.
| Item | Specification |
| Appearance | White powder |
| Melting point | 150°C (lit.) |
| Density | 1.679 g/mL at 25°C (lit.) |
| Odor | Ammonia-like smell |
| Solubility | Highly soluble in water; insoluble in organic solvents such as ethanol and diethyl ether. |
| Stability | Stable in dry, cool conditions; prone to caking when exposed to moisture, though this does not affect its chemical activity. |
Industrial Applications
– As a component of fixers, used for “fixing” photographic film or paper.
– For cleaning and passivating metal surfaces, particularly suitable for pre-treatment before polishing precious metals like copper and silver.
– Serves as a dechlorinating agent to remove residual chlorine after paper bleaching, preventing corrosion and deterioration during long-term storage.
Agricultural Applications
– Functions as a sulfur and nitrogen supplement for crops, particularly beneficial for sulfur-demanding plants like rapeseed and garlic.
-Used in small quantities to adjust alkaline soils, neutralizing soil alkalinity through its mildly acidic properties while supplementing sulfur.
Analytical Chemistry
-Serves as a standard reagent in iodometric titration experiments to determine the concentration of oxidizing agents (e.g., potassium permanganate, potassium dichromate) in samples.
Jinan Jinbang Chemical Co., Ltd., strategically located within the New Materials Industrial Park in Tianqiao District, Jinan City, Shandong Province, stands as a prominent chemical innovator since its establishment in 2015. Operating from a modern, expansive 37,500 m² manufacturing facility, we are dedicated to the research & development, production, and global distribution of high-performance chemical solutions.
We are always committed to delivering optimal chemical solutions for all application scenarios.
