Hydrogencarbonate Indicator
Increasing CO2 in
indicator

yellow

pH 7.6

orange

pH 7.8

Decreasing CO2 in
indicator

Atmo...
Carbon dioxide released from a burning candle or a
terrestrial organism can be added to hydrogen
carbonate indicator.
Start point

pH 8.4 (cherry red);
0.04% CO2 in atmosphere

Respiration or Combustion

pH 8.0 (yellow); more yellow because...
How can we show that plants
use carbon dioxide in
photosynthesis?
Result in bright light
Start point

pH 8.4 (cherry red);
0.04% CO2 in atmosphere

Photosynthesis

pH 9.2 (purple); more purple because CO2 is bei...
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16 b1.33b carbon dioxide indicator

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16 b1.33b carbon dioxide indicator

  1. 1. Hydrogencarbonate Indicator Increasing CO2 in indicator yellow pH 7.6 orange pH 7.8 Decreasing CO2 in indicator Atmospheric CO2 level pH 8.0 red pH 8.2 pH 8.4 magenta pH 8.6 pH 8.8 purple pH 9.0 Hydrogencarbonate indicator is used to measure carbon dioxide levels. It is red in equilibrium with atmospheric air. It becomes more orange/yellow with increased carbon dioxide levels. It changes from red through magenta to deep purple as carbon dioxide is removed. pH 9.2
  2. 2. Carbon dioxide released from a burning candle or a terrestrial organism can be added to hydrogen carbonate indicator.
  3. 3. Start point pH 8.4 (cherry red); 0.04% CO2 in atmosphere Respiration or Combustion pH 8.0 (yellow); more yellow because of increased CO2 produced in respiration or combustion (creates carbonic acid).
  4. 4. How can we show that plants use carbon dioxide in photosynthesis?
  5. 5. Result in bright light
  6. 6. Start point pH 8.4 (cherry red); 0.04% CO2 in atmosphere Photosynthesis pH 9.2 (purple); more purple because CO2 is being removed from the indicator for use in photosynthesis. This reduces the amount of carbonic acid in the solution so it becomes more alkaline

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