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Uploaded by charliemarz on Mar 30, 2010
Universal indicator is used to demonstrate that there is carbon dioxide in exhaled air. Carbon dioxide is an acid and it causes the indicator to change colors.
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thank you so much!!! this was useful :)))
missmandi1200 3 months ago
Very informative
kazalack 1 year ago
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thank you so much!!! this was useful :)))
missmandi1200 3 months ago
Very informative
kazalack 1 year ago