Testing for Gases

The Test for Water Vapour (Steam),  H2O(g).

1)  Water vapour has no colour or smell.

2)  Water vapour has no effect on moist litmus paper
or moist
universal indicator paper - it is neutral.

3)  Water vapour puts out a lit splint.

 

Specific Tests for Water or Water Vapour.

1) Water or its vapour will turn cobalt chloride paper from blue to pink.

2) Water or its vapour turns
anhydrous copper(II) sulfate crystals from white to blue.

3) Water melts at 0°C  and boils at 100 °C.

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