Determine Whether The Dark Or Light Coleus Leaf Had The Presence Of Starch Lab
1. tested and measured? The purpose of this experiment was to determine whether the dark or light coleus leaf had the presence of starch. We used a dark and light leaf to test the presence of starch and how much was produced.
2. Summarize the results and how the results were obtained. Be sure to note the reason for each treatment of the leaves. As appropriate, compare experimental samples to controls.
Both leaves were boiled in water then placed in hot ethyl alcohol. After adding the iodine solution, the dark leaf was brown in the middle and the outer edges were bluish black. The light leaf was brown all over.
3. State your conclusions in the form of a hypothesis which addresses the metabolic pathways that constitute plant photosynthesis. …show more content…
State the purpose of the experimental procedure – what do you expect this experiment to tell you about photosynthesis? What dependent and independent variables are being tested and measured? What important results were expected to be obtained in the experiment? The purpose of this experiment was to determine how much carbon dioxide is produced from plants during photosynthesis. We will be using phenol red to measure the pH and light intensity to see color changes in each test tube. Whether the color intensity of each test tube was acidic, neutral, or basic in pH.
8. Summarize the procedure in past tense/first person language. Make sure to describe all important aspects of the procedure, but do NOT list or cut&paste all the steps as written in the lab handout.
We filled three test tubes with phenol red and blew into each test tube with a straw until it changed a yellow color. Then we placed a sprig of the aquatic plant into one tube with light and the other tube without light. The tube without a plant was used as a control. We wrapped the tube without light in aluminum foil and kept it away from the lamp. The other two tubes were placed 10 centimeters from the light with a beaker of cold water separating the tube and the lamp. We observed the color intensity of the tubes from fifteen to ninety minutes. Recorded the color of the solution in a table in our …show more content…
Explain how phenol red is being used in the procedure and what it will directly and indirectly be used to measure. What chemical shifts in the carbonic acid/bicarbonate equilibrium are expected to occur during specific steps in our experimental procedure?
Blowing in carbon dioxide makes the phenol red change to a yellow color. The yellow color indicates that the pH is acidic, and a red color is either neutral or basic in pH. Carbon dioxide reacts with water to form carbonic acid and then it partially dissociates to bicarbonate and hydrogen ions to get carbonate. The carbonic acid/bicarbonate equilibrium occurs when the tubes are about 10 centimeters from the lamp and the beaker of water is placed between them.
10. Summarize your results. Give important examples, note the trends. As appropriate, compare experimental samples to
2. Summarize the results and how the results were obtained. Be sure to note the reason for each treatment of the leaves. As appropriate, compare experimental samples to controls.
Both leaves were boiled in water then placed in hot ethyl alcohol. After adding the iodine solution, the dark leaf was brown in the middle and the outer edges were bluish black. The light leaf was brown all over.
3. State your conclusions in the form of a hypothesis which addresses the metabolic pathways that constitute plant photosynthesis. …show more content…
State the purpose of the experimental procedure – what do you expect this experiment to tell you about photosynthesis? What dependent and independent variables are being tested and measured? What important results were expected to be obtained in the experiment? The purpose of this experiment was to determine how much carbon dioxide is produced from plants during photosynthesis. We will be using phenol red to measure the pH and light intensity to see color changes in each test tube. Whether the color intensity of each test tube was acidic, neutral, or basic in pH.
8. Summarize the procedure in past tense/first person language. Make sure to describe all important aspects of the procedure, but do NOT list or cut&paste all the steps as written in the lab handout.
We filled three test tubes with phenol red and blew into each test tube with a straw until it changed a yellow color. Then we placed a sprig of the aquatic plant into one tube with light and the other tube without light. The tube without a plant was used as a control. We wrapped the tube without light in aluminum foil and kept it away from the lamp. The other two tubes were placed 10 centimeters from the light with a beaker of cold water separating the tube and the lamp. We observed the color intensity of the tubes from fifteen to ninety minutes. Recorded the color of the solution in a table in our …show more content…
Explain how phenol red is being used in the procedure and what it will directly and indirectly be used to measure. What chemical shifts in the carbonic acid/bicarbonate equilibrium are expected to occur during specific steps in our experimental procedure?
Blowing in carbon dioxide makes the phenol red change to a yellow color. The yellow color indicates that the pH is acidic, and a red color is either neutral or basic in pH. Carbon dioxide reacts with water to form carbonic acid and then it partially dissociates to bicarbonate and hydrogen ions to get carbonate. The carbonic acid/bicarbonate equilibrium occurs when the tubes are about 10 centimeters from the lamp and the beaker of water is placed between them.
10. Summarize your results. Give important examples, note the trends. As appropriate, compare experimental samples to