Week 1

Osmosis Lab Report

Name: ________________________

Date: _________________________

Purpose: To apply the scientific method to observe and report on the process of osmosis and to investigate the effect of osmosis in cells in different solutions.

Directions:Please read the Osmosis Lab instructions fully before beginning your experiment. Also read the textbook passages related to osmosis before filling out the report. Use this report form to record your predictions, observations, analysis, and conclusions. Please leave the report prompts intact and simply enter your responses under each prompt. Because this report form is standard, SafeAssign will flag it with a large overlap score- do not concern yourself with this issue for this report.

Hypotheses

Reflect on your readings related to osmosis and cell membranes. Consider the four solutions in which you will immerse gummy bears. Briefly explain what you think will happen to the different gummy bears under the different conditions. Record which form of solution you prepared for Cup #4 in the appropriate table cell. Be as specific and as detailed as possible. Use the understanding of osmosis that you have developed from reading the text.

Solution	Hypothesis	Explanation
Water Only
Salt Water
Sugar Water
Solution of your choice
No Water

Materials and Methods

See Osmosis Lab Instructions document for materials and methods. A metric ruler will be necessary to measure the length, height, and width in mm.

Results

Use the tables below to record your observations of the gummy bears after Part 1 of the lab and after Part 2 of the lab.

Part 1 Results

1. Record the measurements of the length, height, and width of your gummy bears in Table 1.1 before you place each of them in an experimental solution. Estimate the volume by multiplying the length x height x width.

Table 1.1 Length, height, width of gummy bears (in millimeters, before treatment)

Measurement	Cup # 1	Cup #2	Cup #3	Cup #4	Cup #5
Solution:	water only	Salt water	Sugar water	Your solution	No liquid
Length (mm)
Height (mm)
Width (mm)
Estimated Volume

1. Record the height of each of the experimental solutions you prepare before placing the gummy bears in the solutions. Record which form of solution you prepared for Cup #4 in the appropriate table cell.

Table 1.2 Solution height measurement in mm (without gummy bears)

	Cup #1	Cup #2	Cup #3	Cup #4	Cup #5
Solution:	Water only	Salt water	Sugar water	Your solution	No liquid
Height (mm)					NA

Part 2 Results

1. Briefly describe the steps taken to perform this experiment. How would you describe the process to someone who has not read the lab instructions?

1. Record below the change in the physical characteristics of the gummy bears and solutions after they were immersed in their respective experimental solutions for 12-24 hours. Be careful. The gummy bears are fragile and slippery.

1. Record below the measurements of the gummy bears after they were immersed in their respective experimental solutions for 12-24 hours. Be sure to note what kind of solution was prepared for Cup #4 in the appropriate table cell.

Table 2.1 Length, height, width of gummy bears (in millimeters, after treatment)

Measurement	Cup # 1	Cup #2	Cup #3	Cup #4	Cup #5
Solution:	water only	Salt water	Sugar water		No liquid
Length (mm)
Height (mm)
Width (mm)
Estimated Volume

1. Record the height of each of the experimental solutions you prepare after removing the gummy bears in the solutions. Record which form
3. of solution you prepared for Cup #4 in the appropriate table cell.

Table 2.2 Solution height measurement in mm (after treatment, without gummy bears)

	Cup #1	Cup #2	Cup #3	Cup #4	Cup #5
Solution:	Water only	Salt water	Sugar water		No liquid
Height (mm)					NA

Analysis

1. Compute the change in Length, height, width, and estimated volume of the gummy bearsby subtracting the values for each in Table 1.1 from values from Table 2.1. Record the results in the first row of Table 3.1 (below). Record which form of solution you prepared for Cup #4 in the appropriate table cell.

Table 3.1 Changes in length, height, width, and estimated volume of gummy bears

Measurement	Cup # 1	Cup #2	Cup #3	Cup #4	Cup #5
Solution:	water only	Salt water	Sugar water		No liquid
Change in Length (Table 2.1- Table 1.1)
Change in Height (Table 2.1- Table 1.1)
Change in Width (Table 2.1- Table 1.1)
Change in Estimated Volume (Table 2.1- Table 1.1)

1. Compute the change in solution height for each solution by subtracting the values in Table 1.2 from those in Table 2.2 and recording the result in Table 3.2 (below). Record which form of solution you prepared for Cup #4 in the appropriate table cell.

Table 3.2 Solution height changes (before vs after treatment)

Measurement	Cup # 1	Cup #2	Cup #3	Cup #4	Cup #5
Solution:	Water only	Salt water	Sugar water		No liquid
Change in Height (Table 2.2 -Table 1.2)					NA

1. Write at least three or more paragraphs analyzing your results. Include the following:

• Describe the purpose of this lab assignment.
• Describe and explain your results. How do they relate to the phenomenon of osmosis? (You may need to conduct additional independent research and cite your source.)
• State whether you obtained the results you expected and explain why you did or did not get the expected results.
• Describe the implications of this experiment, what did you learn from this lab experiment?

Conclusion

Write at least two or more paragraphs wrapping up this assignment. Be sure to include the following:

• Summarize the overall knowledge you gained from this lab. How do you think your results might apply to cells generally?
• Propose an osmosis related question that would be interesting to research further.