258121 Sigma-Aldrich

Nitric acid

ACS reagent, ≥90.0%



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   6.6 mmHg ( 20 °C)
  8 mmHg ( 20 °C)
assay   ≥90.0%
dilution test   passes test
ign. residue   ≤0.002%
bp   120.5 °C (lit.)
density   1.48 g/mL at 20 °C (lit.)
anion traces   chloride (Cl-): ≤0.7 ppm
  dissolved oxides: ≤0.1% (as N2O3)
  sulfate (SO42-): ≤5 ppm
cation traces   As: ≤0.3 ppm
  Fe: ≤2 ppm
  heavy metals (as Pb): ≤5 ppm
SMILES string   O[N+]([O-])=O
InChI   1S/HNO3/c2-1(3)4/h(H,2,3,4)



25 g packaged in clear glass bottles; 500 g packaged in poly-coated clear glass bottles

Other Notes

This product has been replaced by 695041-Sigma-Aldrich | Nitric acid ACS reagent, ≥90.0%

Safety & Documentation

Safety Information

Signal word 
Hazard statements 
Supplemental Hazard Statements 
Corrosive to the respiratory tract.
UN 2031A 5.1(8) / PGI
WGK Germany 


Certificate of Analysis (COA)

Please Enter a Lot Number

Certificate of Origin (COO)

Please Enter a Lot Number

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.
What is the molarity of this 90% nitric acid, Product 258121?
Using the density of 1.50 g/mL and the molecular weight of 63.01 g/mol, we can convert the 90% (wt/wt) to a molarity of about 21.4 M.
What is the difference between Product 258121 and the 90% red, fuming nitric acid (Product No. 309079)?
Product 258121 is a colorless to yellow solution of nitric acid that has at least 90% as HNO3 and less than 0.1% dissolved oxides. Product 309079 appears red because it can contain 5-10% of dissolved nitrogen oxide (as N2O3 ).
What is the pH of Nitric acid,Product 258121?
As a 1% solution in water, 90% nitric acid is expected to have a pH that is less than 1.
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 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.
My question is not addressed here, how can I contact Technical Service for assistance?
Ask a Scientist here.
Show more questions
Protocols & Articles

Related Content

Molarity Calculator & Normality Calculator for Acids & Bases

The molarity calculator tool provides lab-ready directions describing how to prepare an acid or base solution of specified Molarity (M) or Normality (N) from a concentrated acid or base solution. To ...

Peer-Reviewed Papers


Related Products

replaced by

Product #


Add to Cart

695041 Nitric acid, ACS reagent, ≥90.0%

Technical Service:

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Bulk Ordering & Pricing:

Need larger quantities for your development, manufacturing or research applications?