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	Acid/base	pH value	Litmus test result
Lemon juice	Acid	Less than 7	Turns blue litmus red
Solution of washing soda	Base	Greater than 7	Turns red litmus blue
Toothpaste	Base	Greater than 7	Turns red litmus blue
Vinegar	Acid	Less than 7	Turns blue litmus red
Stomach juices	Acid	Less than 7	Turns blue litmus red