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Preparation and Standardization of 1M Hydrochloric Acid

Learn how to prepare and standardize 1 M Hydrochloric Acid using anhydrous Sodium Carbonate and Methyl Red solution as indicator.


•  Dilute 85 ml of hydrochloric acid with water to produce 1000 ml.
•  Standardize the solution in the following manner.


•  Weigh accurately about 1.5 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 1 M hydrochloric acid is equivalent to 0.05299 g of Na2CO3.
•  Calculate molarity of solution by following formula:

                      Na2CO3 in mg
M = -----------------------------------
         Hydrochloric Acid in ml  x 52.99

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