Q. 244.8( 6 Votes )
You are provided with three test tubes A, B and C as shown in Figure 5.3 with different liquids. What will you observe when you put
(a) a piece of blue litmus paper in each test tube.
(b) a piece of red litmus paper in each test tube.
(c) a few drops of phenolphthalein solution to each test tube.
(a) Test tube A : Color change to RED
Test tube B: No color Change
Test tube C: No color Change
(b) Test tube A: No Color Change
Test tube B: Color change to Blue
Test tube C: No change
(c) Test tube A: Colourless solution
Test tube B: Pink solution
Test tube C: Colorless solution
Tartaric acid(Solution A) is acidic in nature. Soap (solution B)is basic in nature. Pure water (Solution C ) is neutral in nature.
Acid turns blue litmus red, base turns red litmus blue, neutral substances do not change the color of litmus. Phenolphthalein gives pink color with base and colorless solution with acid and neutral substances.
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Fill in the cross word given as Figure 5.2 with the help of the clues provided.
(2) The solution which does not change the colour of either red or blue litmus.
(4) Phenolphthalein gives pink colour in this type of solution.
(7) Colour of blue litmus in lemon juice.
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(3) It is a natural indicator and gives pink colour in basic solution.
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