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 Form 4 Acids, Bases and Salts Topical Questions and Answers

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 1000cm3 of each sample of water before and after boiling.
(a) Which water sample is
likely to be soft?
(b) Name the cause of
change in the volume of
soap solution used in
sample III

 (6m 24s)
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