Investigating the Strength of Cytoplasm in Potato Cells
AIM
To investigate the strength of cytoplasm in potato cells.
VARIABLES
Strength of solution
Weight of potato
Length of potato
Volume of solution
Temperature of the room
Type of potato
Size of potato
WHAT I ALREADY KNOW
I know that osmosis is when water molecules move from a weak solution
to a strong solution through a semi-permeable membrane.
PREDICTIONS
I predict that the stronger the salt solution is the more likely the
potato will weigh less than what it did at the start of the
experiment.
APPARATUS AND MATERIALS
Potato
Stop clock
Boiling tubes (100ml, 10ml)
Salt solutions of various strengths
A balance
Test tubes
Test tube holders
A scalpel
A teat pipette
DIAGRAM
PLAN
I will get 5 test tubes and place them into the test tube rack. I will
then cut up 5 pieces of potato and weigh them to make sure they all
weigh the same weight to make the test fair. To make the 1% solution
you have 50ml of 2% salt solution already made by the teacher and 50ml
of water, shake the boiling tube up and pour some into the smaller
boiling tube up to 10ml.
I will repeat this process to make 0.5%, 0.4% and 0.2% in a similar
way. I will put each piece of potato into the 5 test tubes and add the
10ml of 2% solution in one test tube, 10ml of 1% solution into another
test tube, 10ml of 0.5% solution in another, 10ml of 0.4% in another
and 10ml of 0.2% into another test tube.
I will then leave all 5 test tubes for 25 minutes because that will be
all the time left in the lesson as the 35 minutes of the beginning of
the lesson will be setting everything up.
At the end of the experiment I will clean up and carefully dry the
5. A second test tube was then filled with water and placed in a test
· Repeat each test three times so that we gat a reasonable result and in the case of getting a ‘freak’ result I will repeat that test.
Osmosis Investigation We are trying to find out what the concentration of the solution is inside the vacuole of a potato cell. We will investigate how the mass of the potato chips changes in different sucrose solution concentrations. We will use osmosis to do this. I will be measuring and controlling many different variables, including. The dependent Variable – Weight of potato chip.
So the experiment will be based upon the movement of water. The first potato chip will be placed in a zero percent solution. I believe that this will increase the mass. I believe this because the zero percent solution has a lower concentration than the cell sap inside the potato. The potato takes on the water through osmosis and the cell pushes out from inside the cell making it swell and become more rigid.
Accurately measure length and mass of the chips again after being in solution and record results. I will alter the molar of the sucrose solution for each potato to see how the concentration affects it. For my experiment I will test five potato chips and repeat my experiment 3 times to get the sufficient amount of results to be able
Size of potato-will be the same as it will be cut using a cork and borer which cuts them all to the same diameter.
Water Potential of Potato Cells Aim: To demonstrate the Water Potential of Potato Cells. Objectives: · To show the water potential of potato cells using various measured concentrations of a sucrose solution and pieces of potato. · To record and analyse data to verify observed results. · The method and procedure was carried out as per instruction sheet. Observations: The experiment shows that the lower the concentration of the sugar solution, in the Petri dish, the mass of the potato increased.
potato contains. From the graph I am able to see that from 0.0 to 0.3
Knife to cut the potato to the correct shape and size for reasons. stated in the method. Tile to not score any school surfaces. Test tubes to hold the potato and solution in. Beaker to alter solution concentration.
We will do this about 4 times and see the difference and see if there is any change.
We then cut our potato tubes with the cork borer and cut them with the scalpel so they were the same length and weighed them. We then put one potato tube in each test tube and then added the same amount sugar solution in to each tube. The concentration of sugar solutions varied in each test tube.
4. Put each group of potato discs in one of the 6 test tubes and watch
· Collect 3 cylinders, and then cut them into 6 pieces of 3 cm with a
Equipment Potato, Borer, Beakers, Measuring Cylinder, Stopclocks, Distilled Water, Electronic Balance, Salt solutions of various concentrations. Diagram [IMAGE] [IMAGE] [IMAGE] When we leave the potato in the solution for the allocated time, water