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Question
What is an indicator?
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Solution
An acid-base indicator is a chemical substance that indicates the acidic or basic nature of a solution by a suitable colour change.
RELATED QUESTIONS
Indicator is a substance which shows different colours in acidic and basic solutions.
If someone is suffering from the problem of acidity after overeating, which of the following would you suggest as remedy?
Lemon juice, Vinegar, Baking soda solution
Give reason for your choice.
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A solution of pH = 8 or a solution of pH = 11.
What colour would the universal indicator show in an aqueous solution of sugar? Why?
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Someone put some universal indicator paper into vinegar. The pH is 3. What does this tell you about the vinegar?
Fresh milk has a pH of 6. When milk changes into curd, the pH value will ______.
A group of students measured the pH of some substances they found in their homes. Their results are given in the following table:
| Substance | pH | Substance | pH |
| Apples | 3.0 | Salt | 7.0 |
| Baking soda | 8.5 | Sugar | 7.0 |
| Black coffee | 5.0 | Toothpaste | 9.0 |
| Household ammonia | 12.0 | Vinegar | 3.0 |
| Lemon juice | 2.5 | Washing soda | 11.5 |
| Milk | 6.5 |
- What would the students have used to measure the pH?
- Which solution is the most acidic?
- Which solution is the most alkaline?
- Which solutions are neutral?
- Which solution can be used to treat wasp stings?
- Which solution can be used to treat bee stings?
Add a few drops of hibiscus indicator to the soap solution. What do you observe?
Name the acid present in vinegar.
