Biology 2.1 Making Chips

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Biology 2.1 Making Chips

• By Biology 12A

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What was the experiment about?

• The experiment was an investigation on the
  process of osmosis using different salt solutions
  to see the change in mass in a potato which will
  effect the concentration.

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The independent variable

• The independent variable was the salt solutions
  of different concentrations. The range of the
  salt solutions was 0.0mol, 0.1, 0.3, 0.5, 0.7,
  0.9.

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Dependent Variable

• The dependent variable is the final mass of the
  potatoes which are measured using a weighing
  scale.

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Reliability

• To ensure reliability in this experiment we used
  three potato samples in each vial with each salt
  solution then took averages in our result taking
  so that there was no random error.

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My results

• My results were both expected and unexpected. I
  expected that the 0.0mol salt solution would
  increase the mass of the potato but I didnt
  expect that the 0.1mol salt solution would have
  made the potato have the biggest weight loss, I
  would have thought that the 0.9mol salt solution
  would have caused the bigger weight loss.

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The science

• The science behind this experiment is OSMOSIS.
  Osmosis is the movement of water through a
  membrane from an area of high concentration to an
  area of low concentration.

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What went wrong

• When drying some of the potato samples I squeezed
  some of the potatoes that some of the water had
  come out which may have made some of the weights
  vary.
• I also think something might have been wrong with
  the salt solutions because the theory of osmosis
  means that the 0.9mol salt solution should have
  caused the most weight loss as it had the lowest
  concentration of water.

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Improvements

• An improvement I could have made in this
  experiment would have been to have used more
  biology terminology in my discussions and
  evaluation.