Sodium Hydroxide

Sodium Hydroxide NaOH = 40.00 (1310-73-2)

Analytical reagent grade of commerce containing not less than 97% of total alkali calculated as NaOH and not more than 2.0% of Na₂CO₃.

White, deliquescent pellets, sticks or slabs.

Assay Dissolve 2 g in 25 mL of water and add 25 mL of barium chloride solution R1 and 0.3 mL of phenolphthalein solution. Titrate with 1m hydrochloric acid VS, add 0.3 mL of bromophenol blue solution and continue the titration with 1m hydrochloric acid VS. Each mL of 1m hydrochloric acid used in the second part of the titration is equivalent to 52.99 mg of Na₂CO₃. Each mL of 1m hydrochloric acid VS used in the combined titrations is equivalent to 40.00 mg of total alkali, calculated as NaOH.

Store in an airtight container.