BIOLOGY LAB

 

Lab:  Osmosis In Potatoes                                      Names: _____________________________

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Problem: How will salt water affect a potato   

 

 

Hypothesis:  ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________

 

 

Experiment:

Materials:

Potato                            measuring spoon

2 250 mL beakers          salt

graduated cylinder          label    

pen                                stirring rod

balance                          plastic wrap or foil

scalpel                           ruler

 

Procedure:

1.      Label one beaker "water" and the other beaker "salt."  Place 100 mL of water into each beaker.

2.      Place 3 tablespoons of salt into the salt beaker and stir until the salt is dissolved.

3.      With a knife, cut two cubes of potato (without skin) that measure 2 cm on each side.  Use caution when cutting the potato.  Cut away from the body.

4.      Using a balance, measure and record the mass of each potato piece.  Then place one piece in the water beaker and the other in the salt beaker.  Record the texture of the potato cubes before soaking (hard or soft).

5.      Cover the beakers with plastic wrap or aluminum foil and allow them to sit undisturbed overnight.

6.      On the second day, carefully remove the potato cubes one at a time and blot them dry on the outside.  Weigh the pieces and record their masses.  Observe any changes in the texture of each cube.

 

 

Data: 

Type of Water Potato Is In

Texture Before Insertion in Water

Texture After Insertion in Water

Mass Before Insertion in Water

Mass After Insertion in Water

Water

 

 

 

 

Salt Water

 

 

 

 


 

 

Conclusions:

1.  Describe what happened to the mass of each cube after soaking. _____________________ ________________________________________________________________________________________________________________________________________________________________________________________________________________________

2.  Describe what happened to the texture of each cube after soaking. ____________________ _______________________________________________________________________________________________________________________________________________________________________________________________________________________

3.  Explain the changes you observed in terms of osmosis._____________________________ ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

 

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