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Testing for Gases

What are the General Tests for Hydrogen Chloride Gas?

1)  Hydrogen chloride gas, HCl(g) has no colour
but it fumes in moist air (it looks misty).

2)  Hydrogen chloride gas has a pungent smell.

3)  Hydrogen chloride gas turns moist litmus paper from blue to red
and moist universal indicator paper to red - it is acidic.

4)  Hydrogen chloride gas is extremely soluble in water.
It dissolves to form hydrochloric acid, a strong acidpH = 1.

5)  Hydrogen chloride gas will put out a lit splint.


What is the Specific Test for Hydrogen Chloride Gas?

Hydrogen chloride gas forms a white smoke with ammonia.
See the test for ammonia gas.


How is Hydrogen Chloride Gas Collected?

Hydrogen chloride gas is more dense than air and can
be collected by downward delivery or by using a gas syringe.

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