CAS Registry Number

CAS 121-57-3 — Sulfanilic acid

CAS 121-57-3 4-(H2N)C6H4SO3H MW 173.19

Sulfanilic acid is an aromatic sulfonic acid derivative used primarily as an intermediate in dye manufacturing, pharmaceuticals, and analytical chemistry. It serves as a key reagent in the synthesis of azo dyes, sulfa drugs, and various organic compounds. This white to off-white crystalline powder has a CAS number of 121-57-3, a molecular formula of 4-(H2N)C6H4SO3H, and a molecular weight of 173.19 g/mol. It is stable under ambient storage conditions but requires careful handling due to its warning-level hazards. Molekula supplies Sulfanilic acid from research to bulk quantities with full documentation and ISO 9001:2015 traceability.

Also known as: Nitrate B Reagent · Sulfanilic acid (Aniline 0.05 % max.)

View product details

Molekula products for CAS 121-57-3

Sulfanilic acid

SKU 18836625

In stock Analytical Reagents

Nitrate B Reagent

SKU 90004974

Made to order Analytical Reagents

Sulfanilic acid (Aniline 0.05 % max.)

SKU 90033382

Made to order Uncategorised

Molekula has supplied fine chemicals and biochemicals since 2000 from ISO 9001:2015 and ISO 14001:2015 certified facilities. Every dispatched batch is logged with a batch number and matched to a Certificate of Analysis, and Safety Data Sheets are available in five languages.