HYDROGENCARBONATE INDICATOR: Used to Show Carbon Dioxide Concentration in a Solution
COLOUR AND CARBON DIOXIDE LEVELS:
COLOUR
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CARBON DIOXIDE CONCENTRATION
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YELLOW
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High
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RED
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Atmospheric
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PURPLE
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Low
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INVESTIGATING EFFECT OF LIGHT ON GAS EXCHANGE
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Plant in Hydrogencarbonate Indicator to Test Effect of Light on Gas Exchange
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METHOD:
Set Up Apparatus as Shown Above
Add Plant into Beaker of Hydrogencarbonate Indicator
Set Distance of Light to Beaker
Allow the Plant to Adapt to Light Intensity for a Few Minutes
Record Colour of Indicator
Alter the Distance of the Lamp to the Beaker and Continue until a Range of Distance is Experimented
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RESULT:
The Closer the Lamp is to the Plant, the Stronger the Light Intensity, So the More Light Energy there is for Chlorophyll to Conduct Photosynthesis, therefore, the More Carbon Dioxide intake causing the Indicator to be Purple as Rate of Photosynthesis Will be Greater than Rate of Respiration, Resulting in Low Levels of Carbon Dioxide
The Further the Lamp is to the Plant, the Weaker the Light Intensity, So Less Light Energy there is for Chlorophyll to Conduct Photosynthesis, therefore, Rate of Respiration is Higher than Rate of Photosynthesis so High Levels of Carbon Dioxide, causing the Indicator to turn Yellow
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