320331 Sigma-Aldrich

Hydrochloric acid

ACS reagent, 37%

  • CAS Number 7647-01-0

  • Empirical Formula (Hill Notation) HCl

  • Molecular Weight 36.46

  •  Beilstein/REAXYS Number 1098214

  •  EC Number 231-595-7

  •  MDL number MFCD00011324

  •  PubChem Substance ID 329753973

  •  NACRES NA.21



Related Categories ACS Grade Acids & Bases, Acids, Acids & Bases, Analytical Reagents, Analytical Reagents for General Use,
Quality Level   200
grade   ACS reagent
vapor density   1.3 (vs air)
vapor pressure   3.23 psi ( 21.1 °C)
  7.93 psi ( 37.7 °C)
assay   36.5-38.0% (ACS specification)
form   liquid
impurities   ≤1 ppm free chlorine
  ≤5 ppm extractable organic substances
ign. residue   ≤5 ppm
color   APHA: ≤10, free from suspended matter or sediment
bp   >100 °C (lit.)
density   1.2 g/mL at 25 °C (lit.)
anion traces   bromide (Br-): ≤0.005%
  sulfate (SO42-): ≤1 ppm
  sulfite (SO32-): ≤1 ppm
cation traces   As: ≤0.01 ppm
  Fe: ≤0.2 ppm
  NH4+: ≤3 ppm
  heavy metals: ≤1 ppm (by ICP-OES)
SMILES string   Cl
InChI   1S/ClH/h1H



2.5, 6×2.5 L in PVC-coated bottle

500, 6×500 mL in PVC-coated bottle

Single 2.5L units require a can opener to open the metal shipping container.

Safety & Documentation

Safety Information

Signal word 
Hazard statements 
Target organs 
Respiratory system
UN 1789 8 / PGII
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.
How do I get lot-specific information or a Certificate of Analysis?
The lot specific COA document can be found by entering the lot number above under the "Documents" section.
How do I find price and availability?
There are several ways to find pricing and availability for our products. Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote. USA customers: 1-800-325-3010 or view local office numbers.
What is the concentration of Product 320331, Hydrochloric acid?
The specification range for concentration of 36.5 - 38.0% corresponds to a concentration range of 12.0 - 12.5 M.
What does ACS stand for?
ACS is the abbreviation for American Chemical Society. ACS grade reagents conform to specifications published by the American Chemical Society, and are suitable for use in analytical procedures.
Is the concentration for Product 320331, Hydrochloric acid, given as w/w or w/v?
The American Chemical Society specifies the concentration reported on a weight/weight basis.
What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
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