Sulfanilic acid 99% ACS Reagent

art: ch121-57-3-1

Available Options

1kg Sulfanilic acid 99% ACS Reagent$32.00
10kg Sulfanilic acid 99% ACS Reagent$300.00
20kg Sulfanilic acid 99% ACS Reagent$580.00


Sulfanilic acid (4-aminobenzenesulfonic acid ) is an off-white crystalline solid which finds application in quantitative analysis of nitrate and nitrite ions. The solid acid exists as a zwitterion, and has an unusually high melting point. Sulfanilic acid has four primary end uses. It is used as an intermediate in the production of yellow food dye, specific pharmaceutical applications, optical brighteners for white paper and as a concrete additive. The sulfanilic acid intermediate can be purchased in four different grades – technical grade, pure grade, sodium sulfanilate solution and sodium sulfanilate dry powder.

PHYSICAL DESCRIPTION: White powder with faint purple tinge. Grayish-white flat crystals. Becomes anhydrous at around 212°F. Low toxicity (used medicinally).

Molar mass
173.19 g/mol
CAS Number
1.4862 g/cm3 at 20°C (68°F)
99% (ACS Reagent)
Initial boiling point and boiling range
ca.300°C (572°F) – OECD Test Guideline 103 – Decomposes below the boiling point.
Water solubility
12.51 g/l at 20°C (68°F) – OECD Test Guideline 105 – soluble
Melting point/freezing point
>300°C (>572°F) – lit.
Partition coefficient: n-octanol/wate
log Pow: – 2.297 at 25°C (77°F)
Auto-ignition temperature
331°C (628°F)
Decomposition temperature
ca.300°C (572°F)


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