2-Naphthol-3,6-disulfonic Acid
Title: 2-Naphthol-3,6-disulfonic Acid
CAS Registry Number: 148-75-4
CAS Name: 3-Hydroxy-2,7-naphthalenedisulfonic acid
Additional Names: R acid
Molecular Formula: C10H8O7S2
Molecular Weight: 304.30
Percent Composition: C 39.47%, H 2.65%, O 36.80%, S 21.07%
Literature References: Prepn from b-naphthol and concd H2SO4: Fierz-David, Blangey, Fundamental Processes of Dye Chemistry (Interscience, New York, 1949) p 197.
Properties: Deliquesc needles. Very sol in water, alcohol. Practically insol in ether. The sodium salt is known as R salt.
Use: In dye chemistry.

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