Root

Delicious

Irish

Diffusion of water through a cell membraneDiffusion of water through a cell membrane

HypertonicHypertonicLower concentration of water than in the cellsLower concentration of water than in the cells

Delicious Irish Root

PROCEDUREPROCEDURE

Step 1: Cut up 3 identical pieces of Step 1: Cut up 3 identical pieces of potato.potato.

Step 2: Prepare a 3% salt hot, cold, and Step 2: Prepare a 3% salt hot, cold, and room temperature water bath.room temperature water bath.

Step 3: Let potato pieces soak for 30 Step 3: Let potato pieces soak for 30 minutes.minutes.

Step 4: Lightly dry and record the new Step 4: Lightly dry and record the new mass.mass.

Initial mass of potato pieces: 2.7 gramsInitial mass of potato pieces: 2.7 grams

HOTHOT Starting Mass: 2.7 Starting Mass: 2.7

gramsgrams Ending Mass: 2.7 gramsEnding Mass: 2.7 grams Solution of 3% salt Solution of 3% salt

waterwater Boiled for 30 minutesBoiled for 30 minutes

NO MASS CHANGENO MASS CHANGE

COLDCOLD

Starting Mass: 2.7 gramsStarting Mass: 2.7 grams Ending Mass: 2.7 gramsEnding Mass: 2.7 grams Solution of 3% salt waterSolution of 3% salt water In freezer for 30 minutesIn freezer for 30 minutes

NO MASS CHANGENO MASS CHANGE

ROOM TEMPERATUREROOM TEMPERATURE

Starting Mass: 2.7 Starting Mass: 2.7 gramsgrams

Ending Mass: 2.6 gramsEnding Mass: 2.6 grams Solution of 3% salt Solution of 3% salt

waterwater Soaked for 30 minutesSoaked for 30 minutes

3.7% MASS LOST3.7% MASS LOST

ERRORERROR

VELOCITY:VELOCITY:

The speed of a molecule The speed of a molecule must be large enough must be large enough to pass through the to pass through the

cell membrane.cell membrane.

The cold water is a prime The cold water is a prime example of this. The example of this. The molecules were not molecules were not moving fast enough, moving fast enough,

and there for could not and there for could not pass throughpass through

Denaturation:Denaturation:When proteins lose their When proteins lose their

tertiary and secondary tertiary and secondary structures due to structures due to trauma or heat.trauma or heat.

The hot water was too The hot water was too hot and caused to hot and caused to

proteins to proteins to destabalive. Molecules destabalive. Molecules could not pass through could not pass through the damaged proteinsthe damaged proteins

CHANGES?CHANGES?

Although we got different data than Although we got different data than expected, the reasons for those expected, the reasons for those fluctuations is known . In the future, fluctuations is known . In the future, cooler hot water and warmer will be cooler hot water and warmer will be used so that a change in mass will be used so that a change in mass will be present.present.

COLD : 3.7 gCOLD : 3.7 g HOT : 3.7 gHOT : 3.7 g ROOM: 3.6 gROOM: 3.6 g