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Experiment to compare oxygen and carbon dioxide content of inhaled and exhaled air

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Introduction

Biology experiment report 1)Aim Experiment to compare oxygen and carbon dioxide content of inhaled and exhaled air. 2) Principle of design a. Collect exhaled air Carbon dioxide produced by body cells during respiration diffuses from the blood into the air sacs and then exhaled. Therefore we can breathe out the exhaled air and through a straw and transfer the exhaled air into the jaw. b. Test oxygen After collecting exhaled air, we compare the time of burning candles burn in both inhaled and exhaled gas jar and find out which contain more oxygen as fire goes out when the oxygen use up. c. Test carbon dioxide We can use hydrogencarbonate indicator to find out which contain more carbon dioxide as if the content of carbon dioxide is enough, it turns hydrogencarbonate indicator from colourless to milkly. ...read more.

Middle

Leave a space under the jaw and put a straw under the jar f. Blow slowly into the gas jar g. Cover the jar and take the jar out of the water 2. Lower a burning candle quickly into one jar of inhaled air. 3. Close the jar and record how long the candle can burn. 4. Repeat with one jar of exhaled air. 5. Add 10cm3 of hydrogencarbonate indicator into one jar of inhaled air. 6. Close the jar and shake. 7. Observe any colour change. 8. Repeat with one jar of exhaled air. 7) Result Inhaled air Exhaled air Time the candle can burn(s) 11s 5s Hydrogencarbonate indicator Remains colourless Turns milky 8) ...read more.

Conclusion

9) Conclusion Oxygen in inhaled air diffuses from the air sacs into blood and is then used by body cells for respiration. Carbon dioxide produced by body cells during respiration diffuses from the blood into the air sacs and is then exhaled. We can find out the oxygen and carbon dioxide content of inhaled and exhaled air in this experiment. Some students wrongly think that inhaled air consists mainly of oxygen, and exhaled air contains mainly of carbon dioxide. In face, both inhaled and exhaled air consists mainly of nitrogen ( about 78%). Some students wrongly think that there is more carbon dioxide than oxygen in exhaled air. Though exhaled air contains a higher proportion of carbon dioxide when compared with that in inhaled air, its absolute amount( in terms of percentage) is still lower than that of oxygen. ...read more.

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