The Effect of Various Solutions on the Size of Potato Pieces
Problem
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It has been found that pieces of potato change size when placed in
various solutions. Investigate.
Plan
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Variables that can change
I can only change one thing at a time but there are many things I
would change. Here is a list of the things I can change;
· Concentration of sugar/salt in the solution
· Size of potato
· Volume of the solution
· Temperature of the solution
Variables that I will change
I am going to change the concentration of the sugar in the solution.
If I do this it will provide me with a good range of results and I
will be able to plot a graph with the results.
Diagram
What I will do
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I am going to get a potato and a cork borer and use the borer to cut 5
pieces of potato out. I am then going to measure each piece of potato
with a ruler, using a scalpel to trim each piece to 40 mm long. I am
going to measure 40ml each of pure water into 5 test tubes and put 1
spatula of sugar into 1 test tube, 2 into the next, 3 into the next
and 4 into the last. I am then going to put a piece of potato into
each tube and leave them all to stand for 12 hours. I am then going to
remove the potato and measure each one again and record any changes. I
am then going to repeat this process to check that my results are ok.
Results table
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Number of spatulas of sugar
Length before (mm)
Length after (mm)
Change (mm)
Average change (mm)
Average % change
A
B
A
B
A
B
0
1
2
3
4
5. A second test tube was then filled with water and placed in a test
We then took 1ml of the 0.1% solution from test tube 2 using the glucose pipette and added it to test tube 3, we then used the H2O pipette and added 9ml of H2O into test tube 3 creating 10ml of 0.01% solution.
2. Drop a gummy bear into each of your prepared beaker or cup and place the beaker or cup
If we say that the right hand side in picture 1 is the potato, and the
3. Add on of the following volumes of distilled water to the test tube, as assigned by your teacher: 10.0mL, 15.0mL, 20.0mL, 25.0mL, 30.0mL. (If you use a graduated cylinder, remember to read the volume from the bottom of the water meniscus. You can make more a more accurate volume measurement using either a pipette or a burette.)
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.
Start with the hot water and first measure the temperature. Record it. 8. Then pour 40 ml into the beaker. You can measure how much water was used by looking at the meniscus.
To improve the method, I would have used a machine to cut the chips to
5.) One at a time, place your test tubes in the water bath and heat the first test tube to 25 , the second to 50 , the third to 75, and the last to 100 degrees c. Remeber to stir with your stirring rod every so often.
We then put the stopwatch on and left them for half an hour. After we weighed each potato tube and recorded our results. We did the experiment twice. We did this to make sure our results were correct. Preliminary method: We did everything the same as in our other experiment except we
2. In the large beaker, put water and boil it completely. After that, remove the beaker from heat. 3. Sample tubes (A-D) should be labeled and capped tightly.
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
The Effect of Salt Solution Concentration On The Mass Of Potatoes Introduction = == == == ==
tube. Add 6 mL of 0.1M HCl to the first test tube, then 0.1M KMnO4 and