given sample. Materials Required: Test tubes, test tube stand, glass rod, phenolphthalein, methyl orange, sodium carbonate salt and the given sample. Principle: In acid medium , In Base medium , (a) Phenolphthalein is colourless (a) Phenolphthalein is pink in colour (b) Methyl orange is pink in colour (b) Methyl orange is yellow in colour (c) Sodium carbonate gives brisk effervescence. (c) Sodium carbonate does not give brisk effervescence.
Procedure: S. No Experiment Observation (Colour change) Inference (Acid / Base) Take 5ml of the test solution in a test tube and add a few drops of Phenolphthalein in it. a) No change in colour. b) Solution Turns pink in colour a) Presence of acid b) Presence of base Take 5ml of the test solution in a test tube and add a few drops of Methyl orange in it.
a) SolutionTurns pink in colour b) SolutionTurns yellow in colour a) Presence of acid b) Presence of base Take 5ml of the test solution in a test tube and add a pinch of sodium carbonate salt. a) Brisk effervescence occurs. b) No brisk effervescence. a) Presence of acid b) Presence of base Result: The given test solution contains (acid / base).
. TEST THE GIVEN SAMPLE FOR THE PRESENCE OF ACID OR BASE Aim: To prove that oxygen is evolved during photosynthesis. Materials required: Test tube, funnel, beaker, pond water and Hydrilla plant. Procedure: .
Take a few twigs of Hydrilla plant in a beaker containing pond water. . Place an inverted funnel over the plant. .
Invert a test tube filled with water over the stem of the funnel. . Keep the apparatus in the sunlight for few hours. Funnel Hydrilla Plant Beaker Test tube Observation: After one hour, it is noted that water gets displaced down from the test tube.
Inference During photosynthesis, oxygen is evolved as a by-product. Gas bubbles liberated from the Hydrilla plant reach the top of the test tube and it displaces the water downwards. Take the test tube and keep the burning stick near the mouth