Litmus paper

 Litmus is a tree lichen fungi and is made into small paper strips or a liquid for testing acids or alkalines.

1. Blue Litmus paper determines if something is acidic. It turns red in solutions with a pH less than 7.

2. Red Litmus paper determines if something is alkaline. It turns blue in solutions with a pH greater than 7.

Materials:

1. Red Litmus paper

2. Blue Litmus paper

3. Sodium Hydroxide

4. Hydrochloric acid

5. Pipette

6. 4 Test tubes

Steps:

1. Rip the litmus paper in half and put half in each test tube.

2. Add 3 drops of hydrochloric acid to the blue litmus paper in test tube 1.

3. Add 3 drops of hydrochloric acid to the red litmus paper in test tube 2.

4. Add 3 drop of Sodium Hydroxide to the blue litmus paper in test tube 3.

5. Add 3 drops of Sodium Hydroxide to the red litmus paper in test tube 4.

Findings:

The blue litmus paper with hydrochloric acid went red.

The blue litmus paper with sodium hydroxide didn't change.

The red litmus paper with hydrochloric acid didn't change.

The red litmus paper with sodium hydroxide went blue.