JSSS
Student
Acids and Bases
Investigation 1 - Effect of solutions on coloured paper
1. Collect pieces of red paper no.1, red paper no.2, blue paper no.1 and blue paper no.2 from your
teacher.
2. Test the solutions labelled as A, B, C, D and E in turn with each type of paper. Use new pieces of
paper for each test. Record your results in the table.
Solution
Effect on red
Effect on red
Effect on blue
Effect on blue
paper no. 1
paper no. 2
paper no. 1
paper no. 2
A
B
C
D
E
3.
Why do you think that it is important to use new pieces of paper for each test?
_______________________________________________________________________________
_______________________________________________________________________________
4.
Divide the solutions that behaved in the same way into groups. Write down your groups.
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Fact
Certain substances, for example hydrochloric acid, are called acids. Other substances, for example
sodium hydroxide, are called bases.
Substances that are neither acids nor bases are called neutral.
The red paper that changed colour in some of your tests is called red litmus paper. The blue paper that
changed
colour
in
some
of
your
-1-
tests
is
called
blue
litmus
paper.