CAIE IGCSE Biology 11.1.3 Testing Inspired & Expired Air
Practise using limewater or hydrogencarbonate indicator to compare carbon dioxide in inspired and expired air.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- state that limewater turns milky or cloudy in the presence of carbon dioxide
- use equal air volumes and comparable flow conditions when testing inspired and expired samples
- predict a faster or stronger positive result for expired air because it contains more carbon dioxide
11.1.3—Differences in composition between question 1
[Maximum number: 1]
State the name of a solution that can be used to test for the presence of carbon dioxide gas.
limewater / hydrogencarbonate indicator (solution) / AVP ;
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