AP Lab 1 Osmosis & Diffusion

Objectives – for main concept  How does osmosis & diffusion work?  Do all particles cross the membrane? Do things flow from low to high or high to low?  Diffusion – movement of particles; osmosis – specifically water  Pg. 8  Molarity is solute concentration – don’t do

Exercise 1A  Using dialysis tubing – semi-permeable membrane  Placing glucose/starch solution in bag  Putting bag into distilled water – test for presence of starch and glucose

1A  New table – put Yes or no CupCupBagBag Before After GluStarGlustar

Exercise 1B – “animal cell”  More dialysis tubing  Pouring different sucrose concentrations in bag  Placing bags in distilled water  Mass of bags before and after

Exercise 1C – “plant cell”  Taking potato cores and placing it in different sucrose solutions  Set up while bags are running  This runs overnight  Take mass before and after

Exercise 1D  We’ll do together  Do not write up in pre-lab

Exercise 1E  Observing plasmolysis under the microscope  Using red onion cells – add salt water and observe  Do while bags are running