An experiment in Osmosis. Method. Remove the potato chip and dab any excess water onto filter paper. Record the length and mass of the chip. Repeat for all six chips. Calculation. You need to calculate the percentage change for each potato chip. The formula is: Change in mass Percentage change = ___________ X 100 start mass Once you have worked out the average for each chip your teacher will give you more data to help you work out a class average for each sucrose solution. Graph. Once you have worked out your class average you need to plot a graph. Conclusion. Write a conclusion about your results. Include information about where you think the potato and sucrose solution are in equilibrium.