Name: _____________________________
Year and Course: ____________________
Subject title: ________________________
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Exercise no. 2
THE DEHYDRATION PROCESS
I.
INTRODUCTION
During summer there is no avoiding that the environment will get so HOT! There’s
no avoiding it (unless you live in Antarctica). When it’s so hot, your body perspire (a.k.a
sweats) as a natural means to thermoregulation itself. All of that perspiration that’s cooling
you down primarily consists of water. The more you perspire the more water comes from
your body and the less dehydrated. Dehydration is an excessive loss of body fluids and can
result in headaches, dizziness, decreased blood pressure, and (in extreme cases) death.
II.
OBJECTIVES
At the end of the experiment, each student will be able to:
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III.
MATERIALS
Stirring rod, knife, chopping board, 1-25ml beaker, platform balance, black
pen (#5), 2 tbsp NaCl
Things to bring: sauce of any dish, 1pc fresh potato
IV.
PROCEDURE:
1. Take your brown paper and mark it with the word “salted” and place in on a flat
surface, such as a table.
2. Place one of the dishes on the paper and the other to the next to it.
3. Fill the dish with an equal amount of water (the water level should be high enough
to fill the dish, but not so high that it overflows).
4. Stir two table spoon of salt into the dish marked “salted”.
5. Using your knife and your chopping board, cut the potato in half. Make sure to cut
the potato so you have two equal size pieces. Weigh each potato before putting
them into different solution.
6. Place one-half of the potato, flat side down, into the dish marked “salted”.
7. Place the other half of potato, flat side own, into the dish with plain water.
8. Let the potatoes sit in the dishes undisturbed for about an hour.
9. Observe the appearance of the potatoes in each solution. Weigh again both potatoes
and record your observation.
V.
DATA TABLE
Weight of potato before
putting the solution
Weight of the potato
after an hour in the
solution
Change of the weights
of each potato before
and
after
being
submerge in the solution
Potato 1
Potato 2
VI. RESULTS AND OBSERVATION
1. What do you think happen to the potato that’s bathing in the plain water?
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2. What happen to the potato that’s bathing in the salted water?
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3. What if you were to use something other than salt, such as vinegar? What would be the
effect on the potato?
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Note:
The salt water is acting a dehydrator by drawing moisture out of the potato. As the water is drawn out of the potato, the
potato begins to get dehydrated. As it dehydrates, the potato shrivels.
VI. CONCLUSION
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