Question

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 please give me answer with diargam


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Answer 1

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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.

Answer 2

Answer:

It is necessary to take precautions to make sure that all of the air inside the equipment has been displaced before using it to collect the hydrogen gas due to the explosive reaction between hydrogen gas and air. Few zinc granules and dilute HCl are taken in a flask attached to a delivery tube and hydrogen gas will be collected over there.

Explanation:

Precautions:

• It is necessary to take steps to make sure that all of the air inside the equipment has been displaced before using it to collect the hydrogen gas. This is due to the explosive reaction between hydrogen gas and air.
• Never smoke in close proximity to a location where hydrogen is produced or used. Eliminate any and all sources of fire and sparks.
• Only in an area that is well ventilated outside should hydrogen be produced and consumed. To completely eliminate the possibility of fire or explosion, precautions must be taken.

Procedure:

• In the first step, add a few grams of zinc granules to a 500 mL flask.
• Step 2: Pour diluted hydrochloric acid over the zinc granules using a thistle funnel. Diluted sulfuric acid can be used as an alternative to hydrochloric acid if it is not readily available.
• Step 3: As water is displaced downhill, hydrogen gas will automatically be gathered with the use of a delivery tube. Given that hydrogen gas is lighter than water, this can be explained.
• The attachment shows the setup for preparing hydrogen gas in a laboratory.
• The following is a list of the chemical processes that happen during this method of producing hydrogen gas:
• Metal + Dilute acid → salt of  metal and acid + Hydrogen gas
• Finally, by forcing water downward, hydrogen gas can be collected.

Thus, It is necessary to take steps to make sure that all of the air inside the equipment has been displaced before using it to collect the hydrogen gas due to the explosive reaction between hydrogen gas and air. Few zinc granules and dilute HCl is taken in a flask attached to a delivery tube and hydrogen gas will be collected over there.

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