HYDROIODIC ACID 10034-85-2

Hydrogen iodide

Hydriodic acid;Anhydrous hydriodic acid;Hydrogen iodide;Hydrogen iodide (HI);Hydrogen monoiodide;Hydroiodic acid;8014-90-2;8052-26-4;39445-43-7;2487183-44-6

10034-85-2

HI

InChIKey=XMBWDFGMSWQBCA-UHFFFAOYSA-N

127.91

127.912285

233-109-9

694C0EFT9Q

1326

1787|2197

DTXSID2044349

Colorless gas; fumes in moist air

28111990

0

2.49

Hydriodic acid appears as a colorless to yellow liquid with a pungent odor. Consists of a solution of hydrogen iodide in water. Fumes irritate the eyes and mucous membranes. Corrosive to metals and to tissue.

1.7 g/cm³

-51 °C

-35.5 °C

126-127°C

1.466 (16ºC)

Solubility in water, g/100ml at 20°C: 0.03

Refrigerator (+4°C)

Vapour pressure, kPa at 25°C: 0.04

Relative vapour density (air = 1): 8.8

In case of H, the pore-forming agent is flammable; in case of cyanide, it produces toxic hydrogen cyanide gas; when heated, it decomposes toxic iodide gas

Acrid

Henry's Law constant = 2.5X10+9 mol/L atm (4.0X10-13 atm-cu m/mol)

SPECIFIC GRAVITY: 2.85 AT -4.7 °C (LIQUID)|Heat of fusion= 0.686|Heat of vaporization: 17.36 kJ/mol @ 25 °C /Hydrogen iodide gas/|Decomposes in light. Unstable at room temperatures and above, slowly decomposing to hydrogen and iodine. /Hydrogen iodide gas/|Dissolves metals, oxides, carbonates, and salts of the other weak, mono-oxidizing acids, causing the formation of iodides.

Soluble in water with release of heat.|Dissolves exothermically in water. The heat may raise toxic and corrosive acidic fumes. Fumes in air.

Acids, Strong Non-oxidizing

Known Catalytic Activity

HYDROIODIC ACID reacts exothermically with organic bases (amines, amides) and inorganic bases (oxides and hydroxides of metals). Reacts exothermically with carbonates (including limestone and building materials containing limestone) and hydrogen carbonates to generate carbon dioxide. Reacts with sulfides, carbides, borides, and phosphides to generate toxic or flammable gases. Reacts with many metals (including aluminum, zinc, calcium, magnesium, iron, tin and all of the alkali metals) to generate flammable hydrogen gas. Reacts violently with acetic anhydride, 2-aminoethanol, ammonium hydroxide, calcium phosphide, chlorosulfonic acid, 1,1-difluoroethylene, ethylenediamine, ethyleneimine, oleum, perchloric acid, b-propiolactone, propylene oxide, silver perchlorate/carbon tetrachloride mixture, sodium hydroxide, uranium(IV) phosphide, vinyl acetate, calcium carbide, rubidium carbide, cesium acetylide, rubidium acetylide, magnesium boride, mercury(II) sulfate [Lewis]. Mixtures with concentrated sulfuric acid can evolve toxic hydrogen iodide gas at a dangerous rate. Decomposes at high temperatures to emit toxic products. Reacts with fluorine, dinitrogen trioxide, nitrogen dioxide/dinitrogen tetraoxide, and fuming nitric acid.|HYDROGEN IODIDE, [ANHYDROUS] is a strongly acidic gas. Reacts rapidly and exothermically with bases. Reacts with active metals in the presence of moisture, including such structural metals as aluminum and iron, to release hydrogen, a flammable gas. Can initiate the polymerization of certain alkenes. Reacts with cyanide compounds to release gaseous hydrogen cyanide. May generate flammable and/or toxic gases in contact with dithiocarbamates, isocyanates, mercaptans, nitrides, nitriles, sulfides, and reducing agents. Additional gas-generating reactions may occur with sulfites, nitrites, thiosulfates, dithionites, and carbonates. Can catalyze chemical reactions among other materials. Decomposes at high temperatures to generate toxic products. Reacts with oxidizing agents to give iodine (when passed through fuming nitric acid, each bubble produces iodine attended by a flash of red flame [Berichte 3:3660]. Ignites in contact with fluorine, dinitrogen trioxide, nitrogen dioxide/dinitrogen tetraoxide.

The gas is heavier than air.

Critical temperature: 151.0 °C; critical pressure: 82.0 atm