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osmosis. Aim: To find out in which solution (salted or pure water) the potatos cell lets more things in.

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Introduction

6.sept.07 Mariela Mezquita 10� Miss Stamp. Biology Diffusion Aim: To find out in which solution (salted or pure water) the potato's cell lets more things in. Prediction: I think that the potatoes at the beaker with pure water will let more water into the cells (increasing its weight) because there isn't anything like salt to hinder the water molecules way into the cell. Apparatus: * Scale * Three 250 ml beakers * A potato * 75 ml of water * 75 ml of salt solution * Measuring cylinder * Potato-cutter * A stop-watch * A napkin Method: 1. ...read more.

Middle

7. Fill a beaker with 50 ml of salt solution. 8. Fill a beaker with the 25 ml of water and the 25 ml of salt solution. 9. Put potatoes' 1, 2, and 3 in the beaker with pure water and start the stop-watch. 10. When the stop watch reaches 20 min take the potatoes out of the water. 11. Dry them. 12. Put potatoes' 4, 5, and 6 in the beaker with the combined solution of water and salt and start the stop watch. ...read more.

Conclusion

Pure water absorbs more than the mixture and the solution. Evaluation: I think my results weren't as accurate as I hoped them to be. Much of the potatoes stayed with the same weight or even more of what they where supposed to have, and maybe this is because at the end we couldn't dry them that much. Conclusion: Potatoes that are in pure water absorb way much more water that potatoes in the other solutions. In salt solution some of the potatoes weight decreased. ...read more.

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