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प्रश्न
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
उत्तर
On the pH scale, bases have values greater than 7, whereas acids have values less than 7. A basic solution turns red litmus blue. An acidic solution turns blue litmus red. With this information, let us separate the substances given below into those with pH values above and below 7.
| Substances | Acid/base | pH value | Litmus test result |
| 1. Lemon juice | Acid | Less than 7 | Turns blue litmus red |
| 2. Solution of washing soda | Base | Greater than 7 | Turns red litmus blue |
| 3. Toothpaste | Base | Greater than 7 | Turns red litmus blue |
| 4. Vinegar | Acid | Less than 7 | Turns blue litmus red |
| 5. Stomach juices | Acid | Less than 7 | Turn blue litmus red |
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