Osmosis Flashcards
What is Osmosis?
Osmosis is the movement of water molecules from an area of high water concentration to low water concentration, across a partially permeable membrane.
Describe how you would carry out an experiment to work out the sucrose concentration in carrot.
Set up test tubes containing different concentrations of sucrose solution (including one with pure water, as a control).
Slice carrot into equal sized pieces and measure their masses.
Place a piece of carrot in each test tube and leave over night/for some time.
Dry and weigh the carrot pieces again.
Calculate the percentage change in mass for each carrot piece and plot it on a graph (
y
y-axis) against the concentration of sucrose (
x
x-axis).
Draw a line of best fit and observe where it crosses the x-axis. This is the concentration of sucrose inside the carrot.
When carrying out scientific investigations, why should you repeat experiments?
It gives you more reliable results because you can identify and remove anomalies and enables you to calculate accurate mean values.
