Why does exhaled air turn limewater chalky faster than inhaled water?

Answer 1

carbon dioxide turns lime water chalky. the more carbon dioxide, the faster the limewater turns chalky. Exhaled air contains carbon dioxide waste from the bodies organs, and that's why it contains more carbon dioxide than inhaled air.

Answer 2

When you breathe out, Carbon Dioxide (CO2) is released. This reacts with the limewater to form a precipitate of calcium carbonate which appears as a white semitransparent substance in the solution.

Because of this phenomenon, limewater is offen used in chemistry as an indicator of Carbon Dioxide. The equation (found on Wikipedia) is here below:
Ca(OH)2 (aq) + CO2 (g) => CaCO3 (s) + H2O (l)

Answer 3

Exhaled air contains carbon dioxide (CO2) from cellular respiration, which reacts with the calcium hydroxide in limewater to form insoluble calcium carbonate (chalky substance). In contrast, inhaled air has lower levels of CO2, resulting in a slower reaction with limewater.