Respiration.

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Presentation transcript:

Respiration

Inhaled and exhaled air Gas % in inhaled air % in exhaled air Oxygen 20 16 Carbon dioxide 0.04 4.00 Nitrogen 79 Other 1

Inhaled / exhaled air Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l) Limewater can be used to test for carbon dioxide. Carbon dioxide turns limewater cloudy white. This is because of the formation of an insoluble calcium carbonate Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)

Hydrogen Carbonate Indicator A bicarbonate indicator (hydrogencarbonate indicator) is a type of pH indicator that is sensitive enough to show a colour change as the concentration of carbon dioxide gas in an aqueous solution increases. Carbon dioxide produces a weak acid in solution. High Medium Low

Hydrogen Carbonate Indicator Draw and predict the colour of the hydrogen carbonate indicator in each tube High CO2 Medium CO2 Low CO2

Anaerobic respiration

Anaerobic respiration

Anaerobic respiration