Preparation and Standardization of 0.1 M Sulphuric Acid

Sulphuric Acid Solution Preparation

• Add slowly, with stirring, 6 ml of Sulphuric acid to about 800 ml of purified water.
• Makeup to 1000 ml with purified water.
• Allow cooling at 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 color is no longer affected by continued boiling.
• 1 ml of 0.1 M sulphuric acid is equivalent to 0.0098 g of Na2CO3.
• Calculate the molarity of solution by the following formula:

             Na2CO3 in mg
M = -----------------------------
            H2SO4 in ml x 9.8
Also see: Determination of Shelf Life of Solutions in Laboratory