Lab Report: Photosynthesis
Your Name:
Purpose of this Lab
What is the goal of this lab? What question is it trying to answer, or what
problem is it trying to explain? Write your answer below.
Hypothesis
After reading the lab instructions - but before starting the lab - record your best
“educated guess” about what will happen in the experiment. Give your reasons
and outline any assumptions that lead you to this hypothesis. Write your answer
below.
Experimental Design
List the materials used in this lab, and a brief explanation of the procedures you
followed. (You do not need to retype the procedure; simply summarize your
procedures). Add #’s where necessary.
Materials:
Procedure (list steps in the order in which you performed them):
Data
Record the data you collected in the lab. Answer all of the questions below.
Experiment 1 Data and Observations:
1. Record the initial pH value of the water in the beaker:
2. Record the pH value of the water in the beaker at:





1:00 PM –
2:00 PM –
3.00 PM –
4:00 PM –
5:00 PM –
3. Record the behavior of the glowing splinter after its placed in the test tube:
4. Record the duration of the burn:
Experiment 2 Data and Observations:
1. Record the initial pH value of the water in the beaker:
2. Record the pH value of the water in the beaker at:





8:00 AM –
9:00 AM –
10.00 AM –
11:00 AM –
12:00 PM –
3. Record the behavior of the glowing splinter after its placed in the test tube:
4. Record the duration of the burn:
Experiment 3 Data and Observations:
1. Record your observations of the leaf after being removed from the boiling
water and being dipped in ethanol. What was accomplished by boiling the
leaf in ethanol?
2. Record your observations of the leaf after staining it with iodine. What
does this test indicate about the two sections of the leaf? In other words,
what is present in most of the leaf that is absent in the area which was foil
covered?
Experiment 4 Data and Observations:
3. Record the initial pH value of the water in the beaker:
4. Record the pH value of the water in the beaker at:




8:00 AM –
9:00 AM –
10.00 AM –
11:00 AM –
5.
Trial 1
Trial 2
Trial 3
Trial 4
Hot plate
temperature
1 pm pH
value
2 pm pH
value
3 pm pH
value
4 pm pH
value
5 pm pH
value
Observations
of Splinter in
test tube
Duration of
burn
Conclusion
After conducting the experiment, how would you now explain the
problem(s) or answer the question(s) raised when you described the
purpose of the lab? Be sure to base your answer on the data you collected.
Consider whether your conclusion is the only explanation for the data you
collected, or if there could be alternate explanations.
1. Recall the discussion of the characteristics of life at the beginning of the
class. What characteristic of life does this lab deal with?
2. What is your familiarity with the terms infrared and ultraviolet? What uses
and/or risks do they pose to humans?