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Assess the effect of different concentrations of salt (NaCl) solution on osmosis in the cells of the potato tuber.

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Introduction

´╗┐The effect f osmosis on potato tissue Aim: To assess the effect of different concentrations of salt (NaCl) solution on osmosis in the cells of the potato tuber. Hypothesis: The change in mass of the potato tuber cells will be inversely proportional to the concentration of salt solution in which they are placed. This is because low concentrations of salt solution will have a higher water potential than the solution inside the potato cells causing the diffusion of water into the cells and an increase in mass. High concentrations of salt solution will have a lower water potential than the solution inside the cells causing the diffusion of water out of the cells and decrease in mass. Variables: Independent Variable Dependent variable Control variables Concentration of salt (NaCl) solution (10%, 20%) %change in mass of cylinders of potato tuber cell 1. Volume of salt solution 2. ...read more.

Middle

Label each beaker in the rack using masking tape. 2. Use a knife to remove the peel from a potato tuber. Using a core borer, cut 4 good cylinders from the potato cylinder (be careful no to muddle them up) and record it in table 1 below. 3. Place each potato cylinder onto one of the 4 solutions. Leave them for as long as possible (at least 30 minutes, but all for the same time). While you are waiting read through the rest of the instructions. 4. Take the cylinders out of the 4 solutions and dry them ? be careful not to mix them up Measure the new mass of each cylinder and record this on table 1. Percentage in mass = New mass ? Original mass x 100 Original mass 1. Complete table 2 (overleaf) with your data and those of the groups. ...read more.

Conclusion

After leaving the potatoes in the solution for half an hour we weighted the potatoes again and we got results showing that the percentage of change in the mass of the potatoes was bigger when the percentage of sucrose in the solution was lower. Analysis: My analysis in relation to the conclusion tells us that I this experiment we can see a clear example of osmosis. The results tells us that when there is a lower amount of sucrose in the solution the mass of the potato rises because sucrose needs water and the potato has more sucrose than the salt in the solution. And when there is a higher amount of sucrose in the water the potato mass decrease, this is because the sucrose in the water is greater than the sucrose in a potato causing the potato to lose mass due to its loss of water caused by the high amount of sucrose in the solution. In this experiment we can determine that the percentage of sucrose in the potato is between 0 and 5 %. ...read more.

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