mention the precautions to be taken in the experiment to show that hydrogen gas is evolved when metals react with acids mention the experimental procedure 8-12 sentence
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Answer:
Precautions to be Taken While Preparing Hydrogen Gas in the Laboratory.
Before collecting the hydrogen gas with the help of the apparatus, precautions must be taken in order to ensure that all the air inside the apparatus has been displaced. This is because hydrogen gas reacts explosively with air.
Procedure for the Laboratory Preparation of Hydrogen Gas
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 in the attachment.
The chemical reactions that take place during the preparation of hydrogen gas via this method are listed 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.