Hydrochloric acid
Aqueous solution of hydrogen chloride / From Wikipedia, the free encyclopedia
This article is about the solution. For the gas, see hydrogen chloride.
Hydrochloric acid, also known as muriatic acid or spirits of salt, is an aqueous solution of hydrogen chloride (HCl). It is a colorless solution with a distinctive pungent smell. It is classified as a strong acid. It is a component of the gastric acid in the digestive systems of most animal species, including humans. Hydrochloric acid is an important laboratory reagent and industrial chemical.[7][8]
Quick Facts Names, Identifiers ...
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Names | |||
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IUPAC name
Chlorane[1] | |||
Other names | |||
Identifiers | |||
3D model (JSmol) |
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ChEMBL | |||
ChemSpider |
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ECHA InfoCard | 100.210.665 | ||
EC Number |
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E number | E507 (acidity regulators, ...) | ||
PubChem CID |
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UNII | |||
UN number | 1789 | ||
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Properties | |||
HCl(aq) | |||
Molar mass | 36.46 g·mol−1 | ||
Appearance | Colorless, transparent liquid, fumes in air if concentrated | ||
Odor | Pungent characteristic | ||
Density | 1.18 g/cm3 | ||
Melting point | Concentration-dependent – see table | ||
Boiling point | Concentration-dependent – see table | ||
log P | 0.00[4] | ||
Acidity (pKa) | −5.9 (HCl gas)[5] | ||
Pharmacology | |||
A09AB03 (WHO) B05XA13 (WHO) | |||
Hazards | |||
GHS labelling: | |||
Danger[6] | |||
H290, H314, H335[6] | |||
P260, P280, P303+P361+P353, P305+P351+P338[6] | |||
NFPA 704 (fire diamond) | |||
Related compounds | |||
Other anions |
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Related compounds |
Hydrogen chloride | ||
Supplementary data page | |||
Hydrochloric acid (data page) | |||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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