Question

How would you prepare:

sodium hydrogen carbonate crystals.

Answer 1

By passing carbon dioxide gas into a cold solution of sodium.

Reaction: 

\[\ce{Na2CO3 + CO2 + H2O -> 2NaHCO3}\]

Procedure:

1. Dissolve nearly 5 grams of anhydrous sodium carbonate in about 25 cm³ of distilled water in a flask.
2. Cool the solution by keeping the flask in a freezing mixture.
3. Pass carbon dioxide gas in the solution.
4. Crystals of sodium bicarbonate will precipitate out after sometime.
5. Filter the crystals and dry it in the folds of filter paper.