What is the effect of changing the concentration of Sodium Chloride Solution on potato cells?

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Biology Investigation

Title

Investigating Osmosis

Aim

What is the effect of changing the concentration of Sodium Chloride Solution on potato cells?

Prediction

I predict that the lower the concentration of Sodium Chloride solution, the higher the final mass and length will be and the higher the concentration of Sodium Chloride solution, the lower the final mass and length.

I also think that with a concentration of 0 and 1 molar, the change in mass and length will be greater than 0.125, 0.25 and 0.5 molar which I think will roughly stay the same.

Osmosis is just a special case of diffusion. It is the net movement of water molecules across a semi-permeable membrane from a region of high water concentration to a region of low water concentration.

     In the diagram the water molecules diffuse into the concentrated sugar solution because the water molecules are small enough to pass through the membrane. The larger the sugar molecules are they are unable to pass through the membrane into the water solution. Osmosis will stop when the two solutions reach equal concentrations on either side of the membrane.

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Equipment

10 Test tubes

Large Potato

4mm Cork borer

Scalpel

Weighing scales

15mm Ruler

Sodium Chloride Solution

Measuring cylinder

Sticky labels

Test tube rack

Paper towels

Safety

To ensure that my experiment is safe I will be sure to wear safely glasses at all times. Take care when using sharp implements like the scalpel and be sure not to spill the Sodium Chloride solution.

Fair test

To ensure that my experiment is a fair test I will follow my method exactly at all times and be sure to use the same ...

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