Take water in a test tube and add few drops of blue litmus to it.with the help of a straw, blow air into the solution. It turns red. Explain the reason behing the color change?
When we are blowing air in the test tube, we are blowing CO2 (Carbondioxide), the carbondioxide reacts with the water (H2O) in the test tube and forms Carbonic Acid (H2CO3), which is acidic in nature and hence the change in colour from blue to red. Since acids turn blue litmus to red.