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Q 1. You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?
Answers (2)
Litmus is a common indicator which is used to identify acid and base. The color of litmus paper turns to blue indicates that the chemical is a base. If there is no change in color, then the chemical is either acidic or neutral.
First marks the three test tube as A, B, and C.
Now,
(i) First of all, put the red litmus paper in each test tube one by one. The test tube in which red litmus paper will turn blue indicates the solution of that test tube is basic/Alkaline in nature.
(ii) Now remaining two are either acidic or neutral. Now mix a drop of the basic solution with a drop of each of the remaining two solutions separately and then the nature of the drops of the mixtures is checked. If the colour of the red litmus turns blue, then the second solution is neutral and if there is no change in colour, then the second solution is acidic. This is because acidic and basic solutions neutralize each other.
The acdic and basic nature of the solution can be identified by using litmus paper. litmus paper. A basic solution turns red litmus to blue litmus and an acdic solution turns the blue litmus to red. the solution whichh changes the red litmus to blue is basic solution . Now , between two solution , which turns the litmus which turned blue because of basic solution , to red , is acidic solution . The last one solution is distilled water
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