Question

You are provided with three test tubes A, B and C as shown in figure with different liquids. What will you observe when you put:
a) A piece of blue litmus paper in each test tube.
b) A piece of red litmus paper in each test tube.
c) A few drops of phenolphthalein solution to each test tube.

Answer 1

Test tube	Effect on blue litmus	Effect on red litmus	Effect on phenolphthalein
A	Changes to red	Remains red	Colourless
B	Remains blue	Changes to blue	Pink colour
C	Remains blue	Remains red	Colourless

Test tube A has an acidic solution. Test tube B has a basic solution. Test tube C has a neutral solution.