Biology 2.1 Biology 2.1 Making ChipsMaking Chips

By: Biology 12ABy: Biology 12A

What was the experiment What was the experiment about?about?

The experiment was an investigation on The experiment was an investigation on the process of osmosis using different the process of osmosis using different salt solutions to see the change in mass salt solutions to see the change in mass in a potato which will effect the in a potato which will effect the concentration.concentration.

The independent variableThe independent variable The independent The independent

variable was the salt variable was the salt solutions of different solutions of different concentrations. The concentrations. The range of the salt range of the salt solutions was 0.0mol, solutions was 0.0mol, 0.1, 0.3, 0.5, 0.7, 0.9.0.1, 0.3, 0.5, 0.7, 0.9.

Dependent VariableDependent Variable

The dependent variable is the final mass The dependent variable is the final mass of the potatoes which are measured using of the potatoes which are measured using a weighing scale.a weighing scale.

ReliabilityReliability To ensure reliability in To ensure reliability in

this experiment we this experiment we used three potato used three potato samples in each vial samples in each vial with each salt solution with each salt solution then took averages in then took averages in our result taking so our result taking so that there was no that there was no random error.random error.

My resultsMy results

My results were both expected and My results were both expected and unexpected. I expected that the 0.0mol unexpected. I expected that the 0.0mol salt solution would increase the mass of salt solution would increase the mass of the potato but I didn’t expect that the the potato but I didn’t expect that the 0.1mol salt solution would have made the 0.1mol salt solution would have made the potato have the biggest weight loss, I potato have the biggest weight loss, I would have thought that the 0.9mol salt would have thought that the 0.9mol salt solution would have caused the bigger solution would have caused the bigger weight loss.weight loss.

The scienceThe science

The science behind this experiment is The science behind this experiment is OSMOSIS. Osmosis is the movement of OSMOSIS. Osmosis is the movement of water through a membrane from an area water through a membrane from an area of high concentration to an area of low of high concentration to an area of low concentration.concentration.

What went wrongWhat went wrong When drying some of the potato samples I When drying some of the potato samples I

squeezed some of the potatoes that some of the squeezed some of the potatoes that some of the water had come out which may have made water had come out which may have made some of the weights vary.some of the weights vary.

I also think something might have been wrong I also think something might have been wrong with the salt solutions because the theory of with the salt solutions because the theory of osmosis means that the 0.9mol salt solution osmosis means that the 0.9mol salt solution should have caused the most weight loss as it should have caused the most weight loss as it had the lowest concentration of water.had the lowest concentration of water.

ImprovementsImprovements

An improvement I could have made in this An improvement I could have made in this experiment would have been to have used experiment would have been to have used more biology terminology in my more biology terminology in my discussions and evaluation.discussions and evaluation.