Chromotropic Acid

Title: Chromotropic Acid
CAS Registry Number: 148-25-4
CAS Name: 4,5-Dihydroxy-2,7-naphthalenedisulfonic acid
Additional Names: 1,8-dihydroxynaphthalene-3,6-disulfonic acid
Molecular Formula: C10H8O8S2
Molecular Weight: 320.30
Percent Composition: C 37.50%, H 2.52%, O 39.96%, S 20.02%
Literature References: Prepn from 4-chloro-5-hydroxy-2,7-naphthalenedisulfonic acid: DE 147852 (1904 to BASF); alternate methods: Frdl. 3, 460-466.
Derivative Type: Dihydrate
Properties: White needles, soluble in water.
Derivative Type: Disodium salt dihydrate
Molecular Formula: C10H6Na2O8S2.2H2O
Molecular Weight: 400.29
Percent Composition: C 30.00%, H 2.52%, Na 11.49%, O 39.97%, S 16.02%
Properties: White needles or leaflets. Very sol in water.
Use: Analytical reagent; intermediate for azo dyes.
Chromous Acetate Chromous Bromide Chromous Chloride Chromous Fluoride Chromous Formate