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Name the source from which litmus solution is obtained. What is the use of this solution?
Litmus solution is obtained from lichens. A natural dye extracted from lichens is dissolved in distilled water to obtain litmus solution.
It is used as an indicator to distinguish between acids and bases.
|
Solution |
Colour of litmus solution |
|
Acidic |
Red |
|
Basic |
Blue |
|
Neutral |
No change |
Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
Consider the following statements:
(a) Both acids and bases change colour of all indicators.
(b) If an indicator gives a colour change with an acid, it does not give a change with a base.
(c) If an indicator changes colour with a base, it does not change colour with an acid.
(d) Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?
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