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प्रश्न
How will you prepare natural indicator from turmeric powder?
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उत्तर
- Turmeric indicator is one of the natural indicator.
- By adding a small amount of water to turmeric powder, a paste is prepared.
- This is applied on a blotting paper or filter paper and dried.
- These strips are used as indicators to find the nature of the solution.
- In acidic solution, turmeric indicator paper has no change in colour.
- That means, it remains yellow. In the basic solution, the colour changes from yellow to red.
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संबंधित प्रश्न
Indicator is a substance which shows different colours in acidic and basic solutions.
- Both acids and bases change colour of all indicators.
- If an indicator gives a colour change with an acid, it does not give a change with a base.
- If an indicator changes colour with a base, it does not change colour with an acid.
- Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?
What colour does the following indicator turn when added to an acid (such as hydrochloric acid)?
Litmus
Onion and vanilla extract are ______ indicators.
A farmer has found that the pH of soil in his fields is 4.2. Name any two chemical materials which he can mix with the soil to adjust its pH.
The pH values of five solutions A, B, C, D and E are given below:
| A | 1 |
| B | 5 |
| C | 7 |
| D | 11 |
| E | 13 |
Which solution is
- weakly alkaline
- neutral
- strongly acidic
- strongly alkaline, and
- weakly acidic?
Which one of the following can be used as an acid- base indicator by a visually impared student?
Acids and bases can be identified in the laboratory by ______.
Name the acid present in vinegar.
Name any two synthetic acid-base indicators.
