R-acid

Name:
R-acid
Detailed information:

Chemistry name:	2-naphthol-3,6-disulfonic acid; β-naphtholdisulfonic acid
Chemistry structure:
Properties:
Deliquescent, colorless needles. Soluble in water, alcohol, and ether.
Derivation:
Sulfonation of β-naphthol. For details see Schaeffer Acid
Use:
Azo dye intermediate. The disodium salt is used as a reagent in detection of nitrogen dioxide in the air.