Preparation and Standardization of 0.5 M Sulphuric Acid with Sodium Carbonate
Preparation: Take 1000ml Volumetric flask and about 250 to 300 ml purified water in it. Measure about 28 ml of Conc. Sulphuric Acid and add in volumetric flask and dilute upto the mark with purified water. Shake well.
Standardization: Weigh accurately about 1.5 g of anhydrous sodium Carbonate 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 boling 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 1M hydrochloric acid is equivalent to 0.05299 g of Sodium Carbonate.
Calculation:
(weight of Sodium Carbonate × 0.5) / (BR × 0.05299)
Generally burrete reading for this titration is found about 28.3 ml
Determine 3 set for this titration and calculate RSD and mean of Molarity.
Limit For RSD is NMT 0.5 % and For Molarity is 0.45 M to 0.55 M.