Preparation and standardization of 0.5 M Sodium Hydroxide BP Volumetric Solution
Dissolve 21 g of Sodium hydroxide in sufficient carbon dioxide free water to produce 1000 mL.
Titrate 20 mL of the solution with 0.5 M Hydrochloric acid VS using the indicator prescribed in the assay in which the solution to be used.
Each mL of 0.5 M Hydrochloric acid VS is equivalent to 0.02 g of NaOH.
Molarity (M) = [Titration reading (in mL) x Exact Molarity of 0.5 M HCl]/
Limit: 0.5 M ± 5 % (0.4750 M – 0.5250 M)
3. PREPARATION OF INDICATORS / REAGENTS :
a. 0.5 M Hydrochloric acid :
Preparation and standardization as per respective procedure.
4. STORAGE CONDITION :
Store in glass-stoppered bottles.