Laboratory preparation of Hydrogen

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100

Metal used to prepare hydrogen in the lab

Zinc

200

Type of reaction between Zn and HCl

Single displacement

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100

Acid commonly used in the preparation of hydrogen

HCl

200

Lightest gas

Hydrogen

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100

Gas collected during the reaction of zinc with dilute acids

Hydrogen

200

Apparatus used to introduce acid into the flask

Thistle funnel

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100

Drying agent used for hydrogen

CaCl₂

200

State any two precautions that must be taken during the laboratory preparation of hydrogen.

•Hydrogen gas is highly inflammable and forms an explosive mixture with air. It must be kept in an airtight container.

•The apparatus should be kept away from flame.

•Air bubbles should be removed from the apparatus.