8964. Sulfosalicylic Acid

Nomenclature

CAS number: 97-05-2
2-Hydroxy-5-sulfobenzoic acid; 3-carboxy-4-hydroxybenzenesulfonic acid; 5-sulfosalicylic acid; 2-hydroxybenzoic-5-sulfonic acid; salicylsulfonic acid.
C7H6O6S; mol wt 218.18.
C 38.53%, H 2.77%, O 44.00%, S 14.70%.

Description and references

Prepn: Pusca et al., Rev. Chim. (Bucharest) 13, no. 1, 49-50 (1962), C.A. 57, 14994b (1962).

Chemical structure

Derivative

Dihydrate.

Nomenclature

CAS number: 5965-83-3
C7H6O6S.2H2O; mol wt 254.21.
C 33.07%, H 3.96%, O 50.35%, S 12.61%.

Properties

White crystals or cryst powder. Colored pink by traces of iron. mp ≈120° when anhydr; at higher temp dec into phenol and salicylic acid. Very sol in water or alcohol; sol in ether. Generally sol in polar solvents. Keep well closed and protected from light.

Caution

Irritating to skin, mucous membranes.

Use

Clinical reagent for albumin in urine; colorimetric reagent for ferric ion with which it gives a violet color. It is a trifunctional aromatic compound, undergoing reactions typical of phenols, carboxylic and sulfonic acid groups. Suggested industrial uses: metal chelating agent, intermediate in the manuf of surface-active agents, organic catalysts and grease additives.