Osmosis and Diffusion Potato Lab.

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Presentation transcript:

Osmosis and Diffusion Potato Lab

What is osmosis and diffusion? Osmosis is the movement of water across a cell membrane from an area of higher concentration to an area of lower concentration. Diffusion is the movement of molecules other than water across a membrane from an area of higher concentration to and area of lower concentration.

Can a potato be used to demonstrate osmosis and diffusion? Potatoes are composed of cells. Potato cells have cell membranes. Potato cells have some water and some salt inside the cells.

Potato Lab Design the Experiment What can we observe that would be evidence of osmosis and diffusion? What can we measure to see if a change takes place? What is the process that will cause a change? What is the variable? What is the control?

Materials 2 Potato slices 2 cups 1 teaspoon of salt Water Balance Marker to label cups

Hypothesis Water Cup-Water will move from the cup into the potato because water outside the cell will be in higher concentration than water inside the cell. This is an example of hypotonic solution. Salt Water Cup- Salt will move into the cell from the cup and water will move out of the cell into the cup because of a difference in concentration. This is a hypertonic solution.

Procedure Label one cup water. Label the other cup salt water. Measure the mass of a potato slice. Record the mass on a cup and place the slice in the cup. Repeat so that each cup has one potato slice.

Procedure Add the same amount of water to each cup so that the potato slices are covered with water. Add 1 teaspoon of salt to the cup labeled salt water. Make sure that the salt dissolves. Let both cups sit at least overnight.

Predictions What do expect to see on Monday? What will each potato feel like on Monday? What will each potato look like on Monday? What will happen to the mass of each potato when you measure it on Wednesday?

Sample Data for Quiz Review Condition Initial Mass Final Mass Change in mass Texture change Potato in tap water 12 grams 14 grams +2 grams More rigid, firmer Potato in salt water 11.5 grams 10 grams -1.5 grams Less rigid, softer Does osmosis explain the changes? Why?