Hydroiodic acid

</table> The chemical compoundhydroiodic acid is a highly acidicaqueoussolution of hydrogen iodide (HI). It is highly corrosive and should be handled only with appropriate precautions. Hydroiodic acid is a commonly used chemical reagent and is one of the strong acids that ionize completely in aqueous solution. Concentrated hydroiodic acid has a pH of less than 1.

Properties

General
Name	Hydrogen iodide
Chemical formula	HI
Appearance	Colourless gas
Physical
Formula weight	127.91 amu
Melting point	222.4 K (-50.8 °C)
Boiling point	237.77 K (-35.38 °C)
Density	1.7 ×103 kg/m3 (liquid)
Solubility	42.5 g in 100g water
Thermochemistry
ΔfH0gas	? kJ/mol
ΔfH0liquid	? kJ/mol
ΔfH0solid	? kJ/mol
S0gas, 1 bar	? J/mol·K
S0liquid, 1 bar	? J/mol·K
S0solid	? J/mol·K
Safety
Ingestion	Toxic, can be fatal.
Inhalation	Fumes may be fatal. Do not give unprotected mouth-to-mouth resuscitation.
Skin	May cause severe burns.
Eyes	Extremely dangerous.
More info
SI units were used where possible. Unless otherwise stated, standard conditions were used. Disclaimer and references </font>