Preparation and standardization of Sulphuric acid standard solution
Pharmaceutical Analysis I Practical: Limit test for (1) Chloride (2) Sulphate (3) Iron (4) Arsenic Preparation and standardisation of (1) Sodium hydroxide (2) Sulphuric acid (3) Sodium thiosulfate (4) Potassium permanganate (5) Ceric ammonium sulphate Assay (1) Ammonium chloride (2) Ferrous sulphate(3) Copper sulphate (4) Calcium gluconate (5) Hydrogen peroxide (6) Sodium benzoate (7) Sodium Chloride Determination of Normality (1) Conductometric titration of strong acid against a strong base (2) Conductometric titration of strong acid and weak acid against a strong base (3) Potentiometric titration
Aim
To Prepare and standardize 0.5 M Sulphuric acid standard solution
Principle
This is direct acid-base titration in which sulphuric acid reacts with sodium carbonate to form carbon dioxide and water. As carbonic acid formed in reaction can change the color of indicator before equivalence point it is advisable to boil solution to perform the errorless titration
Procedure
Preparation of 0.5M Sulphuric acid standard solution
Add slowly, with stirring, ml of sulphuric acid to about 1000 ml of water, allow to cool 25°C
Standardization of 0.5M Sulphuric acid solution Weigh accurately about 1.5 g of anhydrous sodium carbonate, previously heated at about 270ºC for 1 hour. Dissolve it in 100 ml of water and add 0.1 ml of methyl red solution. Add the acid slowly from a burette, with constant stirring, until the solution becomes faintly pink. Heat the solution to boiling, cool, and continue the titration. Heat again to boiling and titrate further as necessary until the faint pink color is no longer affected by continued boiling
Reference
Indian Pharmacopoeia, 2007, volume1, pg. No.316
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