Preparation of Standard solution and Standardization of Hydrochloric acid

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Experiment 1

Preparation of Standard solution and Standardization of Hydrochloric acid

Date: 13-09-2010

Objective

The objective of carrying out this experiment is to determine the concentration of hydrochloric acid (HCl) by using sodium carbonate (Na2CO3) as the primary standard in volumetric analysis.

Procedure

1. All the apparatus are thoroughly washed by de-ionized water before the experiment.

2. About 1.3 g of anhydrous sodium carbonate (Na2CO3) was accurately weighted out using the method of "weighing by difference".

3. The weighed carbonate was transferred to a beaker and about 100 cm3 of de-ionized water added to dissolve it with stirring of glass rod.

4. After dissolving, the solution was transferred to a 250.00 cm3 volumetric flask.

5. The solution was then made up the mark on the neck by adding de-ionized water (add last few drops with dropper.)

6. Pipette and burette are rinsed by the solution to be contained respectively.

7. 25.00 cm3 of sodium carbonate solution was transferred to a clean conical flask using pipette and pipette filler.

8. Two drops of methyl orange indicator were then added to the sodium carbonate solution.

9. 50cm3