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How will different solutions affect the osmosis of carrots and potatos?

Referat / Aufsatz (Schule) 2008 5 Seiten

Biologie - Botanik

Leseprobe

Biological Investigation: Osmosis

Introduction:

The experiment was made in order to check how osmosis occurs in food when its placed in different types of solutions.In my case what was used were carrots and potatos.

Research Question:

How will different solutions affect the osmosis of carrots and potatos ?

Hypothesis:

When we put slices of carrots and potatos seperated in two different solutions like destilated

water,vinigar, and water with 10% and 20% salt concentration,the carrots and potatoes will gain water in the destilated water but they will loose it in the concentration of salt and the vingar.The amount of it will stay the same.

Hypothesis Explanation:

The carrots and potatoes will gain water + mass because the concentration of water will have a higer mass than in the cells of the slices.Its a hypotonic solution.In the waters which are salt concentrated the slices will loose water + mass because the salt water is lower concentrated than in the cells of the slices.It is a hypertonic solution.In the vinegar the concentration of water stays more or less the same as the slices so its isotonic solution.

Compounds:

1 small potatoe

1 carrot

400 ml water

100 ml 10% white vinegar

30 gr salt

Variables:

Dependent

solution in which the slices are put in % mass of the slices gr

independent

Apparatus :

4 beakers

4 Petri dishes

1 scale

1 baguette

1 cylinder volume

1 timer

1 knife

1.We cut the potatoe and the carrots in small slices on the cutting board.Then weight out 12 gr of potatoe slices and also 12 gr of carrots slices.In each of the four Petri dishes are 12 gr of potatoe and carrots.

2.The next step is to prepare the solutions in which the carrots and potatoes will be dipped in.For one solution:The graduated cylinder we measure 90 mL of water and poud it into a beaker.Then we add 10 gr salt to it.The next step is to mix it with the baguette until the salt dissolves.The water we have now has a concentration of 10% salt.We repeat the step and use another beaker where we are mixing 80 mL of water with 20 gr salt to recieve a 20% salt conventration.

3.In the first Petri dish we fill 100ml destillated.

In the second Petri dish we fill 100ml of vinegar.

In the third we will 100ml of 10% concentrated salt water .

In the fourth we fill 100ml of the 20% concentrated salt water.

We let the potatoe and the carrot slices for 30 minutes soaking in the soluitons.

4.After 30 minutes we take the carrot and potato slices out of their Petri dishesThen weigh each group, carrots and potatoes separately. Record these measurements, observing if their mass has either increased or decreased.

5.Design a chart and transfer your results onto that chart. Then draw a graph displaying your results.

Details

Seiten
5
Jahr
2008
Dateigröße
445 KB
Sprache
Englisch
Katalognummer
v159585
Note
Schlagworte
International Baccalaureate Biology SL Investigation Osmosis Felix Dyrek

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Titel: How will different solutions affect the osmosis of carrots and potatos?