Sulfosalicylic Acid

Sulfosalicylic Acid
2-Hydroxy-5-sulfobenzoic acid
Chemical Formula HOC6H3(COOH)SO3H·2H2O
Formula Weight 254.22
Equivalent Weight 127.11 (Molar = 2 Normal)
CAS No. 5965-83-3

Sulfosalicylic Acid solutions can be assayed with standardized Sodium Hydroxide solutions using Phenolphthalein Indicator according to the following reaction:

HOC6H3(COOH)SO3H + 2 NaOH → HOC6H3(COONa)SO3Na + 2 H2O