8573. Sodium Alizarinesulfonate

Nomenclature

CAS number: 130-22-3
9,10-Dihydro-3,4-dihydroxy-9,10-dioxo-2-anthracenesulfonic acid monosodium salt; alizarine S; alizarine carmine; C.I. Mordant Red 3; C.I. 58005.
C14H7NaO7S; mol wt 342.26.
C 49.13%, H 2.06%, Na 6.72%, O 32.72%, S 9.37%.

Description and references

Prepn: Colour Index vol. 4 (3rd ed., 1971) p 4514.

Chemical structure

Derivative

Monohydrate.

Properties

Orange-yellow powder. Freely sol in water with yellow color; sol in alcohol.

Use

As acid-base indicator and in the determination of fluorine, usually used as a 1% aq soln. pH: 3.7 yellow, 5.2 purple; as a reagent for aluminum and stain in microscopy.