What is Litmus?

Academic Physics NCERT Class 7

Litmus is a water-soluble mixture of different dyes extracted from lichens. It is a weekly acidic colored organic dye. It is often absorbed on to filter paper to produce one of the oldest forms of pH indicator. It turns to red in acid solutions and turns to blue in alkaline solutions. It is used as an acid-base indicator.

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Updated on: 10-Oct-2022

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What is Litmus Paper?
What is Indicator and Litmus Solution?
What do you mean by Blue litmus paper and Red litmus paper?
What do we observe on pouring acetic acid on red and blue litmus papers?(A) Red litmus remains red and blue litmus turns red.(B) Red litmus turns blue and blue litmus remains blue.(C) Red litmus turns blue and blue litmus turns red.(D) Red litmus becomes colourless and blue litmus remains blue.
A student puts a drop of reaction mixture of a saponification reaction first a blue litmus paper and then on a red litmus paper. He may observe that:There is no change in the blue litmus paper and the red litmus paper turns white.There is no change in the red litmus paper and the blue litmus paper turns red.There is no change in the blue litmus paper and the red litmus paper turns blue.No change in colour is observed in both the litmus papers.
Blue litmus paper is dipped in a solution, it remains blue what is its nature?
Name the source from which litmus solution is obtained. What is the use of this solution?
Name the source from which the litmus solution is obtained. What is the use of this solution?
Acids turn ____________ litmus solution __________.
Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?
What would be the colour of litmus in a solution of sodium carbonate?
The indicators which turns red in acid solution are:(a) Turmeric and litmus(b) Phenolphthalein and methyl orange(c) Litmus and methyl orange(d) Phenolphthalein and litmus
Which of the following observations is true about dilute solution of acetic acid?(a) It smells like vinegar and turns red litmus blue.(b) It smells like onion and turns blue litmus blue.(c) It smells like orange and turns red litmus blue.(d) It smells like vinegar and turns blue litmus red.
What change will you observe if you test soap with litmus paper (red and blue)?

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