Question

Lab activity of osmosis

Answer 1

EGG OSMOSIS:-
Materials

Prepared eggs (shells removed)

Different solutions of sugar water: 10%, 20%, 30% and 40%

A package of plastic disposable cups

2-3 balances

Paper Towels

Funnels for each sugar-water solution (optional)

Activity Instructions

Before the activity begins, have students brainstorm what they think will happen to the egg in different concentrations of sugar-water. Write different hypothesis on the board.

Have each student group label four cups: 10%, 20%, 30% and 40%.

Each group can get one egg, pat it dry, weigh the egg and place it into the 10% sugar-solution. After waiting five minutes, remove the egg, pat it dry and reweigh it. They need to return the egg to the pure water solution while they calculate the percent change in mass.

If there are several classes, students can return the sugar-water solution to the correct bottle using a funnel.

Repeat this process for the 20%, 30% and 40% solutions.

After the lab is complete, students can compile data and make a class histogram showing the percent change in mass of the eggs for each concentration of sugar water.

Go back to the initial class brainstorm. Are these results what they expected? Why or why not?

Introduce the topic of osmosis to explain what happened.

This activity is geared towards high school biology and chemistry students. However, it can be modified for younger students.

The teacher can use one egg and show how it loses weight as it is placed in different solutions of sugar-water.

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