osmosis

• Osmosis - the net movement of a solvent (i.e. water) from an area of high concentration to a lower concentration through a semi permeable menbrane
• partially permeable membrane - membrane that water particle could penetrate through (partially substance could pass through)
• indenpendent variable - concentration of the solution
• dependent variable - % change in mass of potato chip
• control variables - surface area of the chip, time left in solution, variety of potato
• step 1 - cut potato chips into the same length (in mm, more accurate)
• step 2 - dry each piece on paper towel
• step 3 - measure the starting mass of the potato chips (need to be correct unit)
• step 4 - place one potato chip in each test tube with different concentrations of sugar solutions
• step 5 - leave it for a standard amount of time (2 hours, it's a passive process that require time to occur)
• step 6 - remove from the solution
• step 7 - dry off the excess water - prevent measuring the excess mass
• step 8 - weight the potato chips
• step 9 - work out the percentage change in mass
• Isotonic solution in plant- the cell doesn't have a change in shape, flaccid
• hypotonic solution in plant(less solute, dilute) - the cell would become turgid, cell wall prevents bursting
• hypertonic solution in plant (more solute, concentrated) - the vacuole would shrinks, called plasmolysed
• root hair cell use osmosis
• Isotonic solution in red blood cell- the cell doesn't have a change in shape, bi-concave disc
• hypotonic solution in red blood cell(less solute, dilute) - the cell would become turgid and could bursts
• hypertonic solution in red blood cell (more solute, concentrated) - the cell would shrinks, inefficient on carrying oxygen
• large intestine cell use osmosis