Question

You are provided with three test tubes A, B and C as shown in Figure 5.3 with different liquids. What will you observe when you put *
1 point

a piece of blue litmus paper in each test tube.
a piece of red litmus paper in each test tube.
a few drops of phenolphthalein solution to each test tube​

Answer 1

Explanation:

If the liquid is an acid:

1. Red litmus will not change.
2. Blue litmus will turns to red colour.
3. Phenolphthalein indicator will be colourless.

If the liquid is a base:

1. Red litmus will turn to blue colour.
2. Blue litmus will not change.
3. Phenolphthalein will change to pink colour.

I hope that you find this useful :)

(P.S. It would have been better if you had given the liquids.)