Precautions in laboratory preparation of hydrogen gas.
Answers
Precautions:-
1) Apparatus should be use tight
2) Allow the first few bubbles of hydrogen gas to escape, as they not only contain air, but also form an explosive mixture.
3) Don't bring any naked flame near the apparatus. It is because, if the gas is leaking, it will form an explosive mixture, leading to the bursting of apparatus.
4) The lower end of thistle funnel must dip in the dilute sulphuric acid, as otherwise gas will escape from the thistle funnel.
Answer:
Never smoke near a place where hydrogen is generated or being used. Remove all possible sources of flame and sparks. Hydrogen should only be generated and used in a well ventilated out door area. Precautions must be taken to remove all possibilities of fire or explosion.
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