Rakshita designed an experiment taking two clean test tubes, A and B and filled them with lime water as shown in the figure Class 7

Rakshita designed an experiment taking two clean test tubes, A and B and filled them with lime water as shown in the figure Class 7

Rakshita designed an experiment taking two clean test tubes, A and B and filled them with lime water as shown in the figure. In test tube A, the surrounding air that we inhale was passed on by sucking air from the pipe, and in test tube B, the exhaled air was blown through the pipe (Fig. 9.16). What do you think she is trying to investigate? How can she confirm her findings? Class 7

Answer:

Rakshita is trying to investigate the gas we inhale and exhale while breathing.

The lime water in test tube B turned milky (or cloudy), but the lime water in test tube A did not. Lime water turns milky when it reacts with carbon dioxide. These findings confirm her. Therefore, this indicates that the exhaled air contains more carbon dioxide than the air we inhale.