Sodium Hydroxide VS, Ethanolic

For a 0.1m solution To 250 mL of anhydrous ethanol add 3.3 g of strong sodium hydroxide solution.

Standardisation. Dissolve 0.100 g of benzoic acid in 10 mL of water and 40 mL of ethanol (96 per cent). Titrate with the ethanolic sodium hydroxide solution, determining the end-point potentiometrically (2.2.20) or using 0.2 mL of thymolphthalein solution as indicator. Standardise immediately before use.

1 mL of 0.1 M ethanolic sodium hydroxide is equivalent to 12.21 mg of C₇H₆O₂.