Osmosis Lab Report
1. Introduction
a. Define osmosis in your own words
b. Explain how osmosis is being demonstrated in this experiment in your own words; state this in the form of the ‘purpose’ of the experiment
2. Hypothesis
a. State hypothesis for experiment (what will happen and why, based on the intro?)
3. Methods
a. State specific methods used during experiment, including (be thorough)…
b. How were eggs prepared (vinegar w/ 3% acetic acid)
c. What were the %’s of sucrose used
d. How long were eggs in sucrose and when were they weighed
e. How was data collected
4. Results
a. What was the concentration of the unknown?
i. Explain how you determined this
b. What was the isotonic concentration?
i. Explain how you determined this
c. Write up what you found in Tables 1–3 & Graphs 1–7 in sentences
d. Insert Tables #1–3
i. Weights vs. Time
ii. Change in Weight vs. Time
iii. Change in Weight vs. Sucrose %
e. Insert Graphs #1–7
i. #1–6 Weight CHANGE vs. Time for EACH sucrose concentration
a. INCLUDE LINEAR TRENDLINE
ii. #7 Total Weight Change vs. Sucrose
a. INCLUDE LINEAR TRENDLINE
b. Estimate isotonic point & concentration of unknown from this graph
5. Discussion
a. Discuss findings in terms of osmosis definition from introduction
b. Answer the following questions within your discussion (do not just answer them under the questions – use sentences & paragraphs)
i. What conclusion can you draw from the data in graphs 1–6
ii. Which solutions were hypotonic? Hypertonic? Isotonic?
iii. What would you expect to happen if an egg was put into a sixth beaker containing a 50% sucrose solution? Why?
c. Discuss sources of error that may have caused problems with the results
