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7783-18-8

Basic Information
CAS No.: 7783-18-8
Name: Thiosulfuric acid(H2S2O3), ammonium salt (1:2)
Molecular Structure:
Molecular Structure of 7783-18-8 (Thiosulfuric acid(H2S2O3), ammonium salt (1:2))
Formula: N2H8S2O3
Molecular Weight: 148.20
Synonyms: Ammonium hyposulfite;Thiosulfuric acid, diammonium salt (8CI);Diammonium thiosulfate;Thio-Sul;Thiosulfuric acid (H2S2O3), diammonium salt(9CI);Ammoniumthiosulfate ((NH4)2S2O3) (6CI,7CI);Ammonium thiosulfate solution;Diammonium sulfurothioate;
EINECS: 231-982-0
Density: 1.679g/mLat 25°C(lit.)
Melting Point: 180 °C (dec.)
Boiling Point:
Flash Point:
Solubility: very soluble in water
Appearance: white crystalline solid
Hazard Symbols: R36/37/38:Irritating to eyes, respiratory system and skin.;
Risk Codes: 33-36/37/38
Safety: 26-37
Transport Information:
PSA: 104.48000
LogP: 1.84280
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Reported in EPA TSCA Inventory.

Specification

The Ammonium Hyposulfite, with the CAS registry number 7783-18-8 and EINECS registry number 231-982-0, has the IUPAC name of diammonium thiosulfate. It is a kind of white or colourless crystals, and belongs to the following product categories: Industrial/Fine Chemicals; Inorganics; Ammonium Metal and Ceramic Science; Ammonium Salts; Inorganic Salts; Salts; Synthetic Reagents. It is sensitive to heat, and it is also incompatible with magnesium and aluminum powder. And the molecular formula of the chemical is N2H8S2O3. What's more, It is always used as fixer in the photographic industry.

The physical properties of Ammonium Hyposulfite are as followings: (1)ACD/LogP: -0.43; (2)# of Rule of 5 Violations: 0 ; (3)#H bond acceptors: 3; (4)#H bond donors: 2; (5)#Freely Rotating Bonds: 0; (6)Polar Surface Area: 98 Å2.  

Preparation: First, you should get ammonium sulfite: the ammonium sulfite can be prepared by NH4HCO3, SO2 and H2O. Then ammonium sulfite can react with sulfur, after a series of filtration, evaporation, cooling crystallization, you can get Ammonium Hyposulfite.

You should be cautious while dealing with this chemical. It irritates to eyes, respiratory system and skin, and it has danger of cumulative effects. Therefore, you had better take the following instructions: Wear suitable gloves, and in case of contacting with eyes, rinse immediately with plenty of water and seek medical advice.

You can still convert the following datas into molecular structure:
(1)SMILES: [O-]S([O-])(=O)=S.[NH4+].[NH4+]
(2)InChI: InChI=1/2H3N.H2O3S2/c;;1-5(2,3)4/h2*1H3;(H2,1,2,3,4)
(3)InChIKey: XYXNTHIYBIDHGM-UHFFFAOYAF

The toxicity data is as follows:

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
guinea pig LD50 oral 1098mg/kg (1098mg/kg)   Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 26(6), Pg. 54, 1982.
mouse LC inhalation > 1800mg/m3/4H (1800mg/m3)   Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 29(12), Pg. 53, 1985.
mouse LD50 oral 2100mg/kg (2100mg/kg) BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY)

BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD

BEHAVIORAL: ATAXIA
Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 29(12), Pg. 53, 1985.
rat LC inhalation > 2260mg/m3/4H (2260mg/m3)   Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 29(12), Pg. 53, 1985.
rat LD50 oral 2890mg/kg (2890mg/kg) LUNGS, THORAX, OR RESPIRATION: EMPHYSEMA

KIDNEY, URETER, AND BLADDER: "CHANGES IN TUBULES (INCLUDING ACUTE RENAL FAILURE, ACUTE TUBULAR NECROSIS)"

BLOOD: HEMORRHAGE
Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 26(6), Pg. 54, 1982.