Osmosis required practical

• Purpose is to explore what happens to chipped potatoes in different concentrations of sodium chloride solutions
• Prep: label the boiling tubes with the concentration of sodium chloride you will use.
• Prep: measure out 20 cm3 of each sodium chloride you will use and pour into appropriately labelled tubes.
• Prep: Dry potato chips on paper towe but don’t sqeeze them.
• Experiment: Weigh the chips using a balance and record masses ( it is important to know EXACTLY which chip went into each tube)
• Experiment: the solution should completely cover the chips
• Experiment: leave for at least an hour ( ideally overnight)
• Experiment: Remove chips one at a time and dry on paper towel
• experiment: Reweigh the chips and record the results in the table.
• Change in mass = End mass - Start mass
• % Change = ( change in mass?/ start mass ) X 100
• Equipment: 0 (Distilled water), 0.1, 0.2, 0.3, 0.4 and 0.5 M sodium chloride solutions
• Equipment: 6 Boiling tubes
• Equipment: Paper towel
• Equipment: cork borer cut potatoes
• Equipment: Top pan balance ( scale)
• Equipment: Pen and Paper