Chemistry
How would you prepare sodium hydrogen carbonate crystals.
Acids Bases Salts
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Answer
Sodium hydrogen carbonate crystals:
Method of preparation: By passing carbon dioxide gas into a cold solution of sodium carbonate.
Reaction:
Na2CO3 + CO2 + H2O ⟶ 2NaHCO3
Procedure:
- Dissolve 5 grams of anhydrous sodium carbonate in about 25 cm3 of distilled water in a flask.
- Cool the solution by keeping the flask in a freezing mixture.
- Pass carbon dioxide gas in the solution.
- Crystals of sodium bicarbonate will precipitate out after some time.
- Filter the crystals and dry it in the folds of filter paper.
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The following is a list of methods for the preparation of salts:
A — direct combination of two elements
B — reaction of a dilute acid with a metal
C — reaction of a dilute acid with an insoluble base
D — titration of a dilute acid with a solution of soluble base.
E — reaction of two solutions of salts to form a precipitate.
Choose from the list A to E, the best method of preparing the following salts by giving a suitable equation in each case:
- Anhydrous ferric chloride
- Lead chloride
- Sodium sulphate
- Copper sulphate