C

Chlorosulfuric acid

IUPAC: sulfurochloridic acid

ClSO3H Acids CAS 7790-94-5
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Quick Reference
Formula / NotationClSO3H
CAS Number7790-94-5
Molecular Weight116.53
Melting Point-112 °F (USCG, 1999)
Boiling Point311 °F at 760 mmHg (USCG, 1999)
Density1.75 at 68 °F (USCG, 1999) - Denser than water; will sink
Solubility/COMMON SOLVENTS INCLUDE/ LIQUID SULFUR DIOXIDE, PYRIDINE, & DICHLOROETHANE.
AppearanceChlorosulfonic acid appears as a colorless to yellow colored fuming liquid with a pungent odor. Density 14.7 lb / gal. Causes severe burns. Very toxic by inhalation. Corrosive to metals.
Also Known Assulfurochloridic acid; CHLOROSULFONIC ACID; 7790-94-5; Sulfuric chlorohydrin; Chlorosulphonic acid; Monochlorosulfuric acid; Sulfonic acid, monochloride; 2O9AXL1TJ4; DTXSID1029706; RefChem:125517
CategoryAcids

What is Chlorosulfuric acid?

Chlorosulfuric acid (ClSO3H) is an acid that appears as Chlorosulfonic acid appears as a colorless to yellow colored fuming liquid with a pungent odor. Density 14.7 lb / gal. Causes severe burns. Very toxic by inhalation. Corrosive to metals.. It has a molecular weight of 116.53 g/mol. Its IUPAC name is sulfurochloridic acid. Boiling point: 311 °F at 760 mmHg (USCG, 1999). Melting point: -112 °F (USCG, 1999).

Formula & Notation

ClSO3H

IUPAC Name: sulfurochloridic acid

Other Names / Synonyms: sulfurochloridic acid; CHLOROSULFONIC ACID; 7790-94-5; Sulfuric chlorohydrin; Chlorosulphonic acid; Monochlorosulfuric acid; Sulfonic acid, monochloride; 2O9AXL1TJ4; DTXSID1029706; RefChem:125517

Properties & Characteristics

Appearance: Chlorosulfonic acid appears as a colorless to yellow colored fuming liquid with a pungent odor. Density 14.7 lb / gal. Causes severe burns. Very toxic by inhalation. Corrosive to metals.. Molecular formula: ClHO3S. Molecular weight: 116.53 g/mol. Boiling point: 311 °F at 760 mmHg (USCG, 1999). Melting point: -112 °F (USCG, 1999). Density: 1.75 at 68 °F (USCG, 1999) - Denser than water; will sink. Solubility: /COMMON SOLVENTS INCLUDE/ LIQUID SULFUR DIOXIDE, PYRIDINE, & DICHLOROETHANE.. Vapor pressure: 1.55 mmHg (USCG, 1999). LogP: -0.1.

Physical Data

PropertyValue
Melting Point-112 °F (USCG, 1999)
Boiling Point311 °F at 760 mmHg (USCG, 1999)
Density1.75 at 68 °F (USCG, 1999) - Denser than water; will sink
Molecular Weight116.53
Solubility/COMMON SOLVENTS INCLUDE/ LIQUID SULFUR DIOXIDE, PYRIDINE, & DICHLOROETHANE.
AppearanceChlorosulfonic acid appears as a colorless to yellow colored fuming liquid with a pungent odor. Density 14.7 lb / gal. Causes severe burns. Very toxic by inhalation. Corrosive to metals.

Uses & Applications

Used in industrial chemical synthesis, fertilizer production, battery electrolytes, metal processing, and laboratory acid-base reactions.

Safety Information

Corrosive. Causes severe burns to skin, eyes, and respiratory tract. Wear appropriate PPE including gloves, goggles, and lab coat. Consult SDS before use.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Chlorosulfuric acid
Formula ClSO3H
CAS Number 7790-94-5
Molecular Weight 116.53
Category Acids
Synonyms sulfurochloridic acid; CHLOROSULFONIC ACID; 7790-94-5; Sulfuric chlorohydrin; Chlorosulphonic acid; Monochlorosulfuric acid; Sulfonic acid, monochloride; 2O9AXL1TJ4; DTXSID1029706; RefChem:125517

Frequently Asked Questions

Chlorosulfuric acid (ClSO3H) is an acid that appears as Chlorosulfonic acid appears as a colorless to yellow colored fuming liquid with a pungent odor. Density 14.7 lb / gal. Causes severe burns. Very toxic by inhalation. Corrosive to metals.. It has a molecular weight of 116.53 g/mol. Its IUPAC name is sulfurochloridic acid. Boiling point: 311 °F at 760 mmHg (USCG, 1999). Melting point: -112 °F (USCG, 1999).

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Editorial standards: Chemical data is sourced from peer-reviewed literature, CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA, and IAEA. For educational purposes only — always consult official SDS documentation and qualified professionals before handling chemicals.