Bromothymol Blue Photosynthesis Lab Background In this lab we will investigate the process of photosynthesis We will learn how the amount of light affects photosynthesis To do this we will use ID: 637047
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Slide1
Photosynthesis Lab - Elodea &
Bromothymol
BlueSlide2
Photosynthesis Lab Background
In this lab, we will investigate the process of photosynthesis.
We will learn how the amount of light affects photosynthesis.
To do this, we will use:
An
Elodea plant
,
The chemical
Bromothymol
Blue
Bromothymol
Blue
acts as an indicator to show if photosynthesis is occurring.
Bromothymol
Blue works because it is able to detect the presence of
CO2
(needed for photosynthesis) and
O2
(released during photosynthesis) in solution.
Bromothymol
blue + CO
2
=
green color
Bromothymol
blue + O
2
=
blue colorSlide3
Write the equation for photosynthesis .
Write a hypothesis in an “
If_____then
____” format. You will need to relate this to what happens to water that has CO2 in it and what could happen when a plant is added.Now read the class set of instructions.
On your lab sheet…Slide4
Class set
of Elodea &
Bromothymol
Blue Lab DEMO Instructions…read 1. Pour 75 mL of water into a plastic cup.2. Add
2
mL
of
bromothymol
blue to the water. It should be a blue solution.
3.
GENTLY
blow into the solution causing it to bubble for approximately 1 minute. Use a straw. The solution should turn green.
4.
Label
3 clear containers marked: 1, 2, & 3
• Container 1 will be the control (no Elodea)
• Container 2 will be the Elodea in the dark
• Container 3 will be the Elodea in the light
5. Pour
25
mL
of the solution into each of the three containers.
6. Cover container 1
with plastic wrap (there is no Elodea in container 1), cover completely with tin foil and place it in a safe location near a light source.
7. Add a 7 cm piece of Elodea to container 2
. Using the straw, GENTLY push the Elodea to the bottom of the test tube. Then cover container 2 with plastic wrap and then cover the whole container with tinfoil and place it in a safe location that is completely dark.
8. Add a 7 cm piece of Elodea to container 3
. Using your straw, GENTLY push the Elodea to the bottom of the test tube. Cover the container with plastic wrap. Then place it in a safe location near a light source.Slide5
On your lab sheet for #3 …
Predict what color container 1 will be after the experiment. __________________
Predict what color container 2 will be after the experiment. __________________
Predict what color container 3 will be after the experiment. __________________Slide6
Fill in the Top Column of your data table
Sample
No Elodea covered with tinfoil (control)
Elodea + light and covered with tinfoil
Elodea + light
Color before experiment
Color after experiment