Volumetric Analysis Practicals

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Volumetric Analysis Practicals

1 Preparing a Standard Solution of about 0.2M Sodium Carbonate Accurately Known

2 Standardising Approximately 0.5M Hydrochloric Acid Solution

3 Standardising Approximately 0.2M Sodium Hydroxide Solution

4 Finding the Relative Molecular mass of calcium carbonate in a 'Back Titration'

EXPERIMENT 1

PREPARING A STANDARD SOLUTION OF ABOUT 0.2M SODIUM CARBONATE, ACCURATELY KNOWN

Method

1 Weigh accurately (to two decimal places) between 5.10g and 5.50g of anhydrous sodium carbonate in a weighing bottle. -Fill up the weighing bottle away from the scales so that any spilt sodium carbonate a) does not react with the scales and b) affect the weight.

2 Transfer the sodium carbonate, in small portions, to a 100cm3 beaker and dissolve in distilled water, using a stirring rod to aid dissolution. -Be sure to rinse the weighing bottle out with the distilled water and pour it into the beaker in order to get all of the sodium carbonate.

3 Transfer the solution to a 250cm3 volumetric flask, using the funnel and stirring rod as shown below. -Make sure all solution goes into the volumetric flask by, again, rinsing apparatus with distilled water into