Hydrogen iodideHydrogen iodide (HI) is a diatomic molecule and hydrogen halide. Aqueous solutions of HI are known as hydroiodic acid or hydriodic acid, a strong acid. Hydrogen iodide and hydroiodic acid are, however, different in that the former is a gas under standard conditions, whereas the latter is an aqueous solution of the gas. Read from the Chembox of the Wikipedia article Hydrogen iodide, revision 1380013642.

Property

Value

Formula

HI, 127.91 g/mol

Melting point

-50.8 °C

Boiling point

-35.36 °C

Density

2.85 g/cm³

pKa

-10

The compounds of every Wikipedia article carrying a Chembox or a Drugbox, refreshed daily, with the values their infoboxes give. The pages need JavaScript; the API does not.