Hydroiodic acid

Legality: DEA Listed Chemicals

Production of this substance may be illegal in some jurisdictions under certain circumstances.

21CFR1310.02 a & b

In 1995/6, two lists were created "List I" and "List II", for which commercial manufacturers and distributors must register, and for which possession with the intent to manufacture illegal substances (such as methamphetamine, ecstasy, etc) is illegal. On these a few dozen "precursor" compounds commonly used in the manufacture of illegal drugs.

Bottom line: Do not produce this chemical without checking to make sure that you may do so legally.

 

 

Hydroiodic acid
DEA LIST I/II SUBSTANCE

Chemical formula	HI
OTP appearance	colorless gas
Molar Mass(g/mol)	127.91
Density(g/cc)	2.85(l)
Melting Point(°C)	-50.80
Boiling Point(°C)	-33.56
Solubility in water(g/L)	2450
NFPA 704	0 2 1 COR

Uses

Primary

• Source of iodide in chemical reactions

Natural occurrence

• Does not occur naturally

Production

Synthesis

NB phosphoric acid, rather than sulfuric acid is used to produce acid from iodides, since the sulfuric acid produces side reactions instead.

from iodides

• Combine sodium or potassium iodide with phosphoric acid

  3 KI + H₃PO₄ → 3 HI + K₃PO₄

from iodine

• Combine iodine with hydrazine

  I₂ + H₂N₂ → 2 HI + N₂

• Combine iodine with hydrogen sulfide

  I₂(aq) + H₂S → 2 HI + S

• Combine iodine directly with hydrogen

  I₂ + H₂ → 2 HI