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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.
- 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?
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.
Acids have a pH ______ than 7.
Alkalis have a pH ______ than 7.
The pH of a cold drink is 5. What will be its action on blue and red litmus solutions?
The colour of methyl orange indicator in a solution is yellow. The pH of this solution is likely to be ______.
Here are some results of solutions tested with universal indicator paper:
| Sulphuric acid | : | Red |
| Metal polish | : | Dark blue |
| Washing-up liquid | : | Yellow |
| Milk of magnesia | : | Light blue |
| Oven cleaner | : | Purple |
| Car battery acid | : | Pink |
Arrange the solutions in order of their increasing pH values (starting with the one with the lowest pH).
How could the person change his eating habits to lessen chances of suffering from tooth decay?
Which of the following is not a natural indicator?
