Photosynthesis Lab - Hour 7 by Jeremy Mohn https://padlet.com/jmohn/ppliuuocojg1 Group 8 - Carbon Dioxide Concentration en-us 2016-10-15 21:03:33 UTC 2025-10-30 17:34:28 UTC hello@padlet.com http://d20uo2axdbh83k.cloudfront.net/20141020/47034972b1207c3982eed5f412f5322b.gif Graph jmohn https://padlet.com/jmohn/ppliuuocojg1/wish/130937044 [Insert Image of Graph Here]]]> 2016-10-15 21:03:33 UTC https://padlet.com/jmohn/ppliuuocojg1/wish/130937044 Hypothesis/Prediction jmohn https://padlet.com/jmohn/ppliuuocojg1/wish/130937045 Hypothesis: The higher the concentration of the sodium bicarbonate, the higher the rate of photosynthesis will be.

Prediction: If the concentration of sodium bicarbonate is raised, then the rate of photosynthesis in Spinacia oleracea will increase because the sodium bicarbonate produces carbon dioxide, which the plant uses as a reactant in photosynthesis.
]]> 2016-10-15 21:03:33 UTC https://padlet.com/jmohn/ppliuuocojg1/wish/130937045 Research Question jmohn https://padlet.com/jmohn/ppliuuocojg1/wish/130937046 Does the concentration of sodium bicarbonate affect the rate of photosynthesis in Spinacia oleracea ?]]> 2016-10-15 21:03:33 UTC https://padlet.com/jmohn/ppliuuocojg1/wish/130937046 Procedure jmohn https://padlet.com/jmohn/ppliuuocojg1/wish/130937047
  • Prepare 100mL of 0g, 4g, 5g, and 6g bicarbonate solution.
  • Pour the solution(s) into clear plastic cups to a depth of about 3 cm. Label each cup with the % bicarbonate. Fill an additional cup with distilled water to be used as a control group and label it accordingly.
  • Using a pipette, add one drop of a dilute liquid soap solution to the solution in each cup. If a solution generates suds, dilute it with more water or bicarbonate solution.
  • Using a hole punch, cut 6 or more uniform leaf disks for each cup. Avoid major leaf veins.The leaf surface should be smooth and not too thick.
  • Draw the gases out of the mesophyll tissue and infiltrate the leaves with the solutions by performing the following steps:
    1. Remove the plunger of the syringe. Place six leaf disks into the barrel.
    2. Replace the plunger, being careful not to crush the leaf disks. Push in the plunger until only a small volume of air and leaf disk remains in the barrel.
    3. Pull a small volume of the solution from each cup into a syringe. Make sure no air remains in the barrel.
    4. Create a vacuum in the syringe to draw the air out of the leaf tissue by placing your finger over the end and pulling the plunger back and then releasing it. Repeat the process until the leaves have sunk.
  • Place the leaf disks back in the cups and turn the lamp on, starting the timer.
  • Record when half of the leaf disks have risen to the top of each cup.
    • ]]>     2016-10-15 21:03:33 UTC https://padlet.com/jmohn/ppliuuocojg1/wish/130937047     Conclusion jmohn https://padlet.com/jmohn/ppliuuocojg1/wish/130937048 The data supports the hypothesis in that a higher concentration of sodium bicarbonate would result in a higher rate of photosynthesis. The rate of 4 grams of sodium bicarbonate in 100ml of distilled water had a rate of .0017, 5 grams of sodium bicarbonate resulted in a rate of .0033, and 6 grams resulted in a rate of .0067. No grams of bicarbonate had an estimated rate of .0006. The data suggests that the increase of the rate of photosynthesis is due to the leaves consuming more carbon dioxide than when it is in normal environment. This is significant because it shows that the increase of carbon dioxide will have a higher rate of photosynthesis which can produce oxygen and energy. This experiment can be used to find out how much carbon dioxide can plants intake with the increase of human population producing carbon dioxide. Plants play a key role in reducing carbon dioxide content. 
    There are many sources of error. Once of them was having slightly damaged leaves which would decrease the space of air pockets in the leaves which would result in a lower rate of photosynthesis. Another source of error would be mixing the solution to much where there are no bubbles of carbon dioxide to attach themselves to the leaves to help aid the leaves to rise faster, which would decrease the rate of photosynthesis. In the future, the group should try not to touch the leaves too much so that it won't break, neither increasing nor decreasing the rate of photosynthesis. The group should also put the leaves in all at roughly the same time so that the spacing of time wouldn't factor into the experiment. ]]>     2016-10-15 21:03:33 UTC https://padlet.com/jmohn/ppliuuocojg1/wish/130937048     Results jmohn https://padlet.com/jmohn/ppliuuocojg1/wish/130937049 As the concentration of sodium bicarbonate was increased, the rate of photosynthesis increased and the chips floated to the top faster.]]> 2016-10-15 21:03:33 UTC https://padlet.com/jmohn/ppliuuocojg1/wish/130937049 Effect of Bicarbonate Concentration on the Rate of Photosynthesis jmohn https://padlet.com/jmohn/ppliuuocojg1/wish/131537863 Names: Rachel Sallman, John Tran, Haley Tipton]]> 2016-10-18 16:19:20 UTC https://padlet.com/jmohn/ppliuuocojg1/wish/131537863