OSMOSIS
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An investigation to find the rate of osmosis
In a potato
Using different strengths of salt solution
In this experiment we are trying to find how much osmosis will take place over 20 minutes in different strengths of salt solution. Osmosis is the passage of water from a region of high water concentration through semi-permeable membranes to a region of low water concentration. We will vary the strength of salt solution to see if the potato loses water or gains water. The strengths of slat solution we will use are 1/64, 1/32, 1/16, 1/8, , , 1 and 2 molar salt solutions. 1 molar is 1 relative molecular mass (which is 23g of sodium and 35.5g of chlorine dissolved in 1000cm (ml) of water). So a molar is 1 relative molecular mass dissolved in 2000cm (ml).
Prediction 1: I predict that when the potato is in the hypertonic solution it will lose water and have a lower mass.
Justification 1: This will happen because when osmosis tries to even the concentrations out water will have to pass out into the hypertonic solution to make it isotonic.
Prediction 2: I predict that when the solution is Isotonic the potato will have the same mass and the same amount of water...