Activity 11: Investigating CO₂ in Exhaled Air | Lime Water Test | Class 9 & 10 Biology PBA

Описание: In this video, we perform Activity #11: To Investigate That Exhaled Air Contains Carbon Dioxide, using the simple lime water test. You will clearly see how exhaled air turns lime water milky due to the formation of calcium carbonate (CaCO₃). This practical is perfect for Class 9 and 10 Biology (FBISE), school demonstrations, exam preparation, and practical notebooks.

What you will learn:
✔ Aim of the activity
✔ Materials and setup
✔ Lime water preparation
✔ Step-by-step procedure
✔ Observations and explanation
✔ Why exhaled air has more CO₂
✔ Balanced chemical equation

This activity supports science topics like respiration, gas exchange, breathing mechanism, and composition of air.
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