Hydrocyanic acid
[CAS# 74-90-8]

Identification

• Classification: Chemical pesticide >> Insecticide >> Fumigant
• Name: Hydrocyanic acid
• Synonyms: AC; AC (chemical warfare agent); Agent AC; Carbon hydride nitride (CHN); Evercyn; Formic anammonide; Formonitrile; Hydrogen cyanide; Prussic acid; Zyklon B
• Molecular Formula: HCN
• Molecular Weight: 27.03
• CAS Registry Number: 74-90-8
• EC Number: 200-821-6

Properties

• Solubility: Soluble (89.7 g/L) (25 °C), Calc.^*
• Density: 1.022 g/cm³ (20 °C)^**
• Melting point: 205.5 °C^***
• Boiling point: 183-184 °C (14 Torr)^**
• Refractive index: 1.45968 (17 °C)^**
• Flash point: -32.5±11.2 °C, Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software V11.02 (©1994-2017 ACD/Labs)

^** Auwers, K. V.

^*** Coates, G. E.

Safety Data

• Hazard Symbols: GHS02;GHS06;GHS09 Danger
• Risk Statements: H310-H330-H300-H400-H410

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Acute hazardous to the aquatic environment	Aquatic Acute	1	H400
Chronic hazardous to the aquatic environment	Aquatic Chronic	1	H410
Acute toxicity	Acute Tox.	1	H310
Flammable liquids	Flam. Liq.	1	H224
Acute toxicity	Acute Tox.	1	H330
Acute toxicity	Acute Tox.	1	H300
Specific target organ toxicity - repeated exposure	STOT RE	1	H372
Acute toxicity	Acute Tox.	2	H300
Acute toxicity	Acute Tox.	2	H330