Preparation and Standardization of 1 M Hydrochloric Acid (HCl) with Sodium Carbonate
Preparation: Take 1000 ml volumetric flask, add about 200 to 300 ml purified water in it. Measure about 85 ml concentrate HCl and add slowly in it. Cool the solution and dilute upto the mark with purified water. Shake well and standardized with following procedure.
Standardization: Weigh accurately about 1.5 g of anhydrous sodium carbonate, previously heated at about 270° 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.
Determine 3 set of this Standardization and calculate RSD and mean of molarity.
1 ml of 1M hydrochloric acid is equivalent to 0.05299 g of Na2CO3
Calculation:
(weight of Sodium Carbonate ×1) / (BR × 0.05299)
Generally BR of this titration is found about 28.3 ml