7/26/2019 Preparation of Salt Essay

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Example of essay:

1. Describe how you would prepare soluble salt of magnesium chloride in the laboratory.

2. Based on the chemicals listed below, describe a laboratory experiment to prepare zinc chloride.

Zinc sulphate

Sodium carbonate

Hydrochloric acid

7/26/2019 Preparation of Salt Essay

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Example of essay how to prepare soluble salt of ammonium sulphate:

Answer:

Material: ammonia solution, sulphuric acid and methyl orange.

Apparatus: measuring cylinder, glass rod, filter paper, burette, retort stand, pipette, dropper.

Procedure:

1. By using a pipette, 25 cm3ammonia solution is placed into a conical flask.

2. 2 to 3 drops of methyl orange is added to the solution.

3. A clean burette is filled with sulphuric acid and the initial reading of the burette is noted.

4. The acid is added drop by drop and the flask is swirled.5.

The addition of acid is continued until the indicator changes from yellow to red. The final

reading of the burette is noted.

6. The volume of sulphuric acid needed to neutralise the ammonia solution is calculated.7. The step 1 to5 is repeated without adding the methyl orange and exactly the calculated volume

of acid is added into the flask.

8. The content of the flask is then heated until one third of the solution remains.9. The hot saturated solution is allowed to cool for crystallisation occur.10.The crystal of ammonium sulphate is filtered out, washed with distilled water and dried

between sheets of filter paper.

11.The white crystal formed is ammonium sulphate.

H2SO4 + 2 NH3 (NH4)2SO4 + 2 H2O