take water in a test tube and a few drops of blue Litmus to it with the help of straw low air into the solution it turns red explain the reason of colour change
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it turns to red because it is acidic solution and if it is basic then it will turn to blue
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when you blow air into water you release carbon dioxide which mixes with water to make carbonic acid which is acidic in nature . Therefore blue litmus paper changes to red indicating that the solution is acidic in nature
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