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प्रश्न
What is an indicator? Name three common indicators.
What is an indicator?
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उत्तर १
Indicators are substances that show a distinct change (colour or odour) simultaneous to a change in concentration of ions such as H+ and OH- ions.
Examples: Methyl orange, phenolphthalein and litmus solution.
उत्तर २
An indicator or acid-base indicator is a chemical substance which indicates the acidic or basic nature of a solution by suitable colour change.
संबंधित प्रश्न
What is the effect of adding sodium hydroxide solution to these olfactory indicators?
The pH of soil A is 7.5 while that of soil B is 4.5. Which of the two soils, A or B, should be treated with powdered chalk to adjust its pH and why?
Two solutions X and Y are tested with universal indicator. Solution X turns orange whereas solution Y turns red. Which of the solutions is a stronger acid?
Two solutions X and Y have pH = 4 and pH = 8, respectively. Which solution will give alkaline reaction and which one acidic?
Fill in the following blank with suitable words:
Alkalis have a pH.............. than 7.
What is a universal indicator? For what purpose is it used?
The salt whose aqueous solution will turn blue litmus to red is:
(a) ammonium sulphate
(b) sodium acetate
(c) sodium chloride
(d) potassium carbonate
In acidic solution, the colour of the hibiscus indicator paper will change to _____.
Acids and bases can be identified in the laboratory by ______.
Give names of any two natural indicators.
