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Biology Coursework - Osmosis - To Investigate concentration of sucrose solution is isotonic to potato cell sap.

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  • Essay length: 878 words
  • Submitted: 11/07/2002
  • Marked by teacher: (?) Adam Roberts
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AS and A Level Exchange, Transport & Reproduction

Teacher essay summary

4 star(s)

****
A good summary of the investigation but the concise style means that insufficient detail and explanation are included in places. The author has a mostly sound grasp of background theory.

Marked by teacher Adam Roberts 05/09/2013

The first 200 words of this essay...

Biology Coursework - Osmosis

Planning

Aim: To investigate what concentration of sucrose solution is isotonic to potato cell sap.

Apparatus: 0M sucrose (aq) (distilled water)

2M sucrose (aq)

Potato

Chip cutter

Knife

Boiling tubes

Measuring cylinder (25cm3)

Vernier callipers (to nearest 0.1mm)

Balance (to nearest 0.01gram)

Safety: I will ensure safety around the lab by: wearing safety goggles, laying paper towels, removing baggage from walking space, push stools under the bench, stand up, walk carefully and slowly - don't rush and handle equipment and apparatus carefully.

Preliminary Experiment: I did a small experiment before doing the real one so I could find a suitable range to base my investigation round. I used 3 chips in 3 boiling tubes, each containing 20cm3 of: 0M sucrose, 0.5M sucrose and 1M sucrose.

Moles of Sucrose /M

Original Mass /g

Mass after 3 hours /g

Up/Down in mass

0M

8.02

9.94

Up

0.5M

8.18

7.83

Down

1M

8.83

7.20

Down

As you can see from

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MbT essay summary

****
A good summary of the investigation but the concise style means that insufficient detail and explanation are included in places. The author has a mostly sound grasp of background theory.

Marked by teacher Adam Roberts 05/09/2013

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