[PDF] [PDF] Potato Osmosis - California State University, Bakersfield

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burst and your brain expands so much it pushes on the skull, leading to brain damage What is different about a plant cell placed in a hypotonic solution and an 

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The SWELLING AND BURSTING of animal cells when water enters is called The shrinking of ANIMAL cells that are placed in a HYPERTONIC solution is

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In a hypotonic solution, animal cells experience osmosis and a pressure builds up in the cell What causes the pressure? (Be specific) Hypotonic solution = lower concentration than cell 8

[PDF] Potato Osmosis - California State University, Bakersfield

can burst On the other hand, plant cells become turgid in a hypotonic solution In a hypertonic solution, animal cells shrink dramatically while plant cells become 

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See also all your cell membrane, diffusion, and osmosis-related handouts 1 is why plant cells do not burst like animal cells do when in a hypotonic solution)

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Label the type of solution hypertonic, hypotonic, or isotonic on the line below the picture 3 Why don't plant cells burst if a lot of water diffuses into them?

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A Hypertonic solution has more solute (so LESS water) than the cell A cell In a hypotonic environment, animal cells will swell until they burst, a process

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outside solution is HYPOTONiC to the cell (mea thus water moves into cell from region of HIGH > LOW conc If an animal cell gains too much water it can BURST" :

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Plant cells are turgid in hypotonic environments (Animal cells burst, or lyse, in this condition ) The high water potential of a hypotonic solution causes water to 

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A solution is hypertonic to a cell if it has a higher solute (dissolved substance) When plants are placed in hypertonic solutions, their vacuoles shrink and

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This material is based upon work supported by the CSUB Revitalizing Science University Program (REVS-UP) funded by

Chevron Corporation. Opinions or points of view expressed in this document are those of the authors and do not necessarily

reflect the official position of the Corporation or CSUB. California State University of Bakersfield, Department of Chemistry

Potato Osmosis

Standards:

MS-LS1-2 Develop and use a model to describe the function of a cell as a whole and ways parts of cells contribute to the function.

Introduction:

Osmosis is the movement of fluids (usually water) from a lower concentration of solutes to a higher concentration of solutes through a semi-permeable membrane to equalize the concentration on both sides. Osmosis in an animal cell is somewhat different to osmosis in a

plant cell; this is due to the cell wall that plant cells have. When an animal cell is in a hypotonic

solution, it usually swells up and since there is no cell wall to keep it from swelling too much it can burst. On the other hand, plant cells become turgid in a hypotonic solution. In a hypertonic solution, animal cells shrink dramatically while plant cells become plasmolysed which happens because the cell wall does not change shape but the cell membrane shrinks inside the cell. In this experiment you will see the effects of putting a potato in a hypertonic solution and hypotonic solution.

Materials:

Salt Water

Potato

Knife (adult needed)

2 Plates or bowls

Scale

This material is based upon work supported by the CSUB Revitalizing Science University Program (REVS-UP) funded by

Chevron Corporation. Opinions or points of view expressed in this document are those of the authors and do not necessarily

reflect the official position of the Corporation or CSUB.

Safety:

Always have an adult with you to help you during your experiment. Always wear eye protection and gloves when doing chemistry experiments

Procedure:

1. Prepare salt water solution by adding 30 ml of salt to 70 ml of water.

2. Pour salt water in bowl and regular water in another.

3. Cut potato in half lengthwise.

4. Weigh each potato slice.

5. Place one slice flat side down in salt water solution and the other slice in the regular

water.

6. Leave overnight.

7. Observe changes in potato slices and weigh again.

Data and Observations:

Record your observations in this space

Potato Mass (g)

A (salt solution)

B (water)

1. What happened to the potato that was in the salt solution? Why did that happen?

2. What happened to the potato that was in the water? Why did that happen?

3. Try putting the potato back together as one. Do they fit perfectly as they did before the

experiment? Why or why not?

References:

1. Osmosis in Potatoes. Plants for Kids.

http://herbarium.desu.edu/pfk/page17/page18/page19/page19.html (Accessed: July 16,

2014).

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