Question

Separate the following into substances having pH values above and below 7. How do these influence litmus paper?
(i) Lemon juice
(ii) Solution of washing soda
(iii) toothpaste
(iv). Vinegar
(v). Stomach juices.

Answer 1

Solutions having pH values above 7: solution of washing soda and toothpaste (They turn red litmus paper blue), Solutions having pH values less than 7: Lemon juice, Vinegar and stomach juices (they turn blue litmus paper red).