a) A student was supplied with colourless liquid suspected to be water.
(i) Describe two chemical test that could have been used to show that liquid was water.
(ii) How could it have been shown that liquid was pure water?
Answer:
i)Add a drop of the liquid to anhydrous white copper(II)sulphate and it will turn blue.
Or
Add a drop of the liquid to anhydrous cobalt chloride paper which turns from blue to pink
ii)By finding the boiling of water which is #100^0C# at one atmosphere pressure
Or
By finding the freezing point of water which is #O^0C# at one atmosphere
Or
Add a drop of the liquid to anhydrous cobalt chloride paper which turns from blue to pink
ii)By finding the boiling of water which is #100^0C# at one atmosphere pressure
Or
By finding the freezing point of water which is #O^0C# at one atmosphere
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in an experiment, soap solution was added to three separate samples of water. The table below shows the volumes of the soap solutions required to form lather with #1000cm^3# of each sample of water before and after boiling.
a) Which water sample is likely to be soft? Explain.
(b) Name the cause of change in the volume of soap solution used in sample III 
