Question

Separate the following into substances having pH values above and below 7. How do these influence litmus paper ?

1. Lemon juice

2. Solution of washing soda

3. Toothpaste

4. Vinegar

5. Stomach juices

Answer 1

Substances having pH values above 7: Solution of washing soda and toothpaste; They will turn red litmus paper blue due to their basic nature.

Substances having pH values less than 7: Lemon juice, vinegar and stomach juices; They will turn blue litmus paper red due to their acidic nature.