| Identification | Back Directory | [Name]
Nitrohydrochloric acid | [CAS]
8007-56-5 | [Synonyms]
Aqua regia
Knigswasser
Nitrohydrochloric acid
Aqua regia (Nitrohydrochloric acid)
Aqua regia (75% hydrochloric + 25% nitric acid) | [Molecular Formula]
ClHNO2 | [MOL File]
8007-56-5.mol | [Molecular Weight]
82.4664 |
| Chemical Properties | Back Directory | [Appearance]
red, yellow or gold fuming liquid | [Stability:]
Pressure will develop in sealed bottles. Incompatible with (and may react violently with) a wide variety of materials, including metals, oxidising agents, reducing agents, combustible materials. | [CAS DataBase Reference]
8007-56-5 |
| Hazard Information | Back Directory | [Chemical Properties]
red, yellow or gold fuming liquid | [Uses]
Metallurgy, testing metals, dissolving metals. | [General Description]
A yellow liquid with a pungent odor prepared by mixing nitric acid and hydrochloric acid, usually in a ratio of one part of nitric acid to three or four parts of hydrochloric acid. Fumes are irritating to the eyes and mucous membranes. Corrosive to metals and to tissue. Density 14.7 lb /gal. | [Air & Water Reactions]
Fumes in air. Soluble in water with release of heat. | [Reactivity Profile]
Nitrohydrochloric acid is a powerful oxidizing agent and a strong acid. Reacts exothermically with chemical bases (for example: amines and inorganic hydroxides) to form salts and water. Reacts with most metals, including gold and platinum, to dissolve them with generation of toxic and/or flammable gases. Can initiate polymerization in polymerizable organic compounds. Reacts with cyanide salts to generate toxic hydrogen cyanide gas. Generates flammable and/or toxic gases with dithiocarbamates, isocyanates, mercaptans, nitrides, nitriles, sulfides, and weak or strong reducing agents. Additional exothermic gas-generating reactions occur with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), and carbonates (CO2). | [Hazard]
A powerful oxidizer, toxic, corrosive liquid. | [Health Hazard]
TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns or death. Reaction with water or moist air will release toxic, corrosive or flammable gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution. | [Fire Hazard]
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars etc.). Substance will react with water (some violently), releasing corrosive and/or toxic gases and runoff. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water. | [Agricultural Uses]
Aqua regia is an extremely effective oxidizing solvent,
capable of dissolving metals like gold and platinum. It is
made of a mixture of one part concentrated nitric acid and
three parts hydrochloric acid. |
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