Question

to identify the gas produced by methods experiment chemistry.
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Answer 1

Answer:

The method of collecting the gas depends on its density relative to air, unless you collect the gas over water in an inverted test tube - then it doesn't matter.

If the gas is less dense than air e.g. hydrogen or ammonia, the test tube must be inverted and the gas will rise into it to displace the more dense air.

If the gas is heavier than air e.g. carbon dioxide or chlorine (in fume cupboard), the test tube is in its normal upright position and the gas will sink in displacing the less dense air.

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Answer 2

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Aim : to identify the gas produced by various methods .

Theory : When a substance is heated it made decompose ❟ sublime❟ produce a gas or undergo any other ❟ chemical change .Also a substance may produce a gas when treated with a suitable Reagent like in dilute hydrochloric acid or dilute sulphuric acid . The gas evolved can be identified by its own specific properties like colours , smell and chemical nature.

Apparatus and chemicals : Test tube , test tube holder , bunsen burner , unknown substance , common laboratory reagents like dil. HCL , dil. H2SO4 etc.

Method : Heat A Pinch of the given salt in a dry test tube on bunsen burner flame or treat the salt with HCl or H2SO4 in a test tube and identify the gas as described in the observation table .

Note: For identification of gases the observation table is in the attachment .

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