Laboratory
Exercise 2
Investigating osmosis
using potato cylinder(柱)
Quick revision
Quick revision
What happens to the plant when its cell
becomes flaccid?
• It will “lose weight”;
• It will become “softer”;
• Wilting 枯萎;
What happens to the plant when its cell
becomes turgid?
• It will “gain weight”;
• It will become longer (for a potato cylinder);
Test your guessing
• Your are provided with around 30ml of 1 mol/dm3 NaCl solution and distilled
water;
• Make around 20ml NaCl solution of each concentration (the table below);
• Measure and take note of the beginning length and mass of each potato
cylinder;
• Put one into each solution;
• Leave them there for 1h;
• Measure the length and mass again and calculate the percentage;