Why is the purpose of lime water in test tube B ?
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for production of bubbles (oxygen is taken out)
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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. ... Breathing out through the mouthpiece bubbles exhaled air through tube B.
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