Sulphuric Acid Solution Preparation:
• Add slowly, with stirring, 6 ml of Sulphuric acid to about 800 ml of purified water.
• Make up to 1000 ml with purified water.
• Allow to cool 25°C.
Sulphuric Acid Solution Standardization:
• Weigh accurately about 0.2 g of anhydrous Sodium Carbonate, previously heated at about 270°C 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 colour is no longer affected by continued boiling.
• 1 ml of 0.1 M sulphuric acid is equivalent to 0.0098 g of Na2CO3.
• Calculate molarity of solution by following formula:Na2CO3 in mg
M = -----------------------------
H2SO4 in ml x 9.8
Also see: Determination of Shelf Life of Solutions in Laboratory
Ankur Choudhary is India's first professional pharmaceutical blogger, author and founder of Pharmaceutical Guidelines, a widely-read pharmaceutical blog since 2008. Sign-up for the free email updates for your daily dose of pharmaceutical tips.
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