CAS 7783-18-8 Ammonium thiosulfate - Materials / Alfa Chemistry

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Ammonium thiosulfate

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Catalog Number

ACM7783188

CAS Number

7783-18-8

Product Name

Ammonium thiosulfate

Structure

Category

Electrolytes

Description

Ammonium thiosulfate is a white crystalline solid. It is very soluble in water. The primary hazard is the threat posed to the environment. Immediate steps should be taken to limit its spread to the environment. It is used in photography, in chemical analysis, and for many other uses.;Liquid

IUPAC Name

diazanium;dioxido-oxo-sulfanylidene-ж╦6-sulfane

Molecular Weight

148.21g/mol

Molecular Formula

H8N2O3S2

Canonical SMILES

[NH4+].[NH4+].[O-]S(=O)(=S)[O-]

InChI

InChI=1S/2H3N.H₂O3S2/c;;1-5(2,3)4/h2*1H3;(H2,1,2,3,4)

InChI Key

XYXNTHIYBIDHGM-UHFFFAOYSA-N

Boiling Point

Decomposes (NTP, 1992)

Melting Point

Decomposes at 302° F (NTP, 1992);150 °C (DECOMP)

Purity

98%

Density

2 at 68 °F (USCG, 1999);1.679

Solubility

64 % at 68° F (NTP, 1992);VERY SOL IN COLD WATER; IN 100 CC OF WATER: 103.3 G @ 100 °C; SLIGHTLY SOL IN ACETONE;INSOL IN ALCOHOL, ETHER

Appearance

Solid

Application

Ammonium thiosulfate serves multiple purposes across various industries. Primarily, it is used as a liquid fertilizer due to its high nitrogen and sulfur content, which supports plant growth by decomposing into ammonium sulfate and colloidal sulfur upon application. This decomposition ensures that the ammonium sulfate is immediately available as a nutrient, while the sulfur oxidizes over time to provide a sustained release of nutrients. Additionally, ammonium thiosulfate acts as a urease inhibitor, prolonging the availability of nitrogen when used in combination with urea-ammonium nitrate solutions. Beyond agriculture, it functions as a photographic fixing agent, an analytical reagent, a fungicide, and a brightener in silver-plating baths, capitalizing on its unique chemical properties. This crystalline salt, characterized by its ammonia odor, is soluble in water and non-corrosive, making it suitable for storage in steel or aluminum containers. Its compatibility with nitrogen and nitrogen-potassium solutions enhances its versatility.

Color/Form

COLORLESS, MONOCLINIC CRYSTALS;WHITE CRYSTALS

Complexity

82.6

Corrosivity

Copper-base alloys are seriously corroded by ... ammonium thiosulfate with corrosion rates exceeding 10 kg/(square meter year) at 100 °C.;High silicon cast iron has reasonable corrosion resistance /to ammonium thiosulfate/ with a corrosion rate < 4.4 kg/(square meter year) at 100 °C.;The corrosion rate for stainless steels /to ammonium thiosulfate/ is < 440 g/(square meter year) at 100 °C.

Covalently-Bonded Unit Count

EC Number

231-982-0

Exact Mass

147.997634g/mol

Formal Charge

Heavy Atom Count

MeSH Entry Terms

ammonium thiosulfate

Monoisotopic Mass

147.997634g/mol

Odor