Question

How is hydrogen gas prepared in laboratory ? Explain along with chemical equation.

Answer 1

Explanation:

Step 1: Take a few grams of zinc granules and place them in a 500 mL flask.

Step 2: With the help of a thistle funnel, add dilute hydrochloric acid to the zinc granules. If hydrochloric acid isn’t available, dilute sulphuric acid can be used as an alternative.

Step 3: Hydrogen gas will be automatically collected with the help of a delivery tube via the downward displacement of water. This can be explained by the fact that hydrogen gas is lighter than water.

The setup for the laboratory preparation of hydrogen gas is illustrated below.



The chemical reactions that take place during the preparation of hydrogen gas via this method are listed below.

General Format: Metal + Dilute Acid → Salt of Metal & Acid + Hydrogen

With Hydrochloric Acid: Zn + 2HCl → ZnCl2 + H2

With Sulphuric Acid: Zn + H2SO4 → ZnSO4 + H2

Finally, the hydrogen gas can be collected by the downward displacement of water.

Answer 2

The laboratory preparation of hydrogen gas usually involves the action of dilute sulphuric acid or dilute hydrochloric acid on zinc granules.

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