How to Prepared and Standardize of 0.5 N Hydrochloric Acid Volumetric Solution
Preparation of 0.5 N Hydrochloric Acid Volumetric solution
➤ Glass ware and instruments required.
Beaker, Glass stirrer, Graduated Pipettes, Graduated cylinder, Analytical balance, Sucker, Volumetric flask, Fume hood.
➤ Reagents required.
Hydrochloric acid.
Molecular wt HCl, 36.46
Sodium carbonate primary standard. (Previously dried for 1 hour at 270°C - 300°C)
Methyl red indicator.
➤ Preparation.
Transfer 42.5 ml of Hydrochloric acid reagent grade to 1000 ml volumetric flask containing 100 ml water, dilute up to the mark with same solvent.
➤ Standardization.
Preparation of 0.5 N Hydrochloric Acid Volumetric solution
➤ Glass ware and instruments required.
Beaker, Glass stirrer, Graduated Pipettes, Graduated cylinder, Analytical balance, Sucker, Volumetric flask, Fume hood.
➤ Reagents required.
Hydrochloric acid.
Molecular wt HCl, 36.46
Sodium carbonate primary standard. (Previously dried for 1 hour at 270°C - 300°C)
Methyl red indicator.
➤ Preparation.
Transfer 42.5 ml of Hydrochloric acid reagent grade to 1000 ml volumetric flask containing 100 ml water, dilute up to the mark with same solvent.
➤ Standardization.
Accurately weigh about 0.75 g
sodium carbonate PS, previously dried for 1 hour at 270° - 300°, in 250 ml
conical flask. Dissolve in 100 ml water. Add 2 drops of methyl red indicator
solution. Titrate with 0.5 N / 0.5 M hydrochloric acid till the solution
becomes faint pink. Heat the solution to boiling, cool to room temperature by
holding the flask under tap water. Continue titration to faint pink colour.
Repeat the steps of heating and cooling till faint pink colour is restored.
Note this final end point as
burette reading in ml.
➤ Calculations.
g Na2CO3 x 0.5
N / M =
--------------------------------------------------
0.026495 x
Burette reading in ml
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