Question

why must the students take care to bubble air through the lime water at the same rate in both parts of this experiment​

Answer 1

Answer:

When carbon dioxide, CO2, enters the limewater, the limewater becomes cloudy. When you exhale into the bottle, the limewater will turn cloudy.

Lime water is a calcium hydroxide solution, Ca(OH)2, which is a base. ... When I exhaled into the solution, the carbon dioxide in a person's breath reacted with the water to form Carbonic Acid. When enough carbonic acid is formed it neutralizes the lime water, which is a base and makes the solution an acid.Limewater can be used to detect carbon dioxide. If carbon dioxide is bubbled through limewater then it turns from clear to cloudy/milky in colour. This is why limewater used in a simple respirometer can show that more carbon dioxide is present in exhaled air compared to inhaled air.