you blow into a glass of lime water and you will see weather or not it has carbon dioxide in it if it does then it will go foggy :)
Carbon dioxide absorbed in water form carbonic acid; the pH of th solution is increased - this change can be evaluated with a pH paper.
You make it bubble through calcium hydroxide (or lime water). If it goes cloudy, then you have carbon dioxide.
by the process of photosynthesis
you bubble carbon dioxide through lime water and if it turns cloudy carbon doixide is present. So the answer is limewater.
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