8670. Sodium Rhodizonate

Nomenclature

CAS number: 523-21-7
5,6-Dihydroxy-5-cyclohexene-1,2,3,4-tetrone disodium salt; [(3,4,5,6-tetraoxo-1-cyclohexen-1,2-ylene)dioxy]disodium.
C6Na2O6; mol wt 214.04.
C 33.67%, Na 21.48%, O 44.85%.
Chemical structure

Properties

Violet crystals. Sol in water with an orange-yellow color; slightly sol in soda soln; insol in alc. Solns are unstable even in the refrigerator, and must be prepd fresh every other day.

Use

As a reagent for barium and strontium.