# osmosis and potato chipsWatch

This discussion is closed.
#1
i am doing this coursework and i was just wonder how the width of the potato cylinders would affect the changes in mass and length? also, if i had some potato cylinders which were 2cm and some which were 4cm, which set would be more likely to increase in length or mass after the investigation? and anyone have any ideas of roughly what percentage?

this is all for pleminary work.
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14 years ago
#2
(Original post by londongirl)
i am doing this coursework and i was just wonder how the width of the potato cylinders would affect the changes in mass and length? also, if i had some potato cylinders which were 2cm and some which were 4cm, which set would be more likely to increase in length or mass after the investigation? and anyone have any ideas of roughly what percentage?

this is all for pleminary work.
4cm.........greater surface area for osmosis to take place over. Although it would all depend on concentration of solution.
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14 years ago
#3
that experiment is so boring!
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#4
ok thanks. yeh i'm going to use different concentrations - 0.2, 0.4, 0.6, 0.8 and 1M for the pre-test. so would the greater the concentration mean that the bigger the change in mass and length... and even bigger for the 4cm pieces?
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14 years ago
#5
(Original post by CharleeB)
that experiment is so boring!

sorry i know thats not helpful, but i had to do it and it was.
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14 years ago
#6
(Original post by londongirl)
ok thanks. yeh i'm going to use different concentrations - 0.2, 0.4, 0.6, 0.8 and 1M for the pre-test. so would the greater the concentration mean that the bigger the change in mass and length... and even bigger for the 4cm pieces?
well weak conc will make get bigger and strong make it get smaller.
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#7
ok thank you

and i like ur sig
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14 years ago
#8
the more dilute it is the bigger the they will get, but if u put them in the really conc. solution then the smaller they get. you have to plot ure results to see the biggest change, it could be up or down.
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14 years ago
#9
(Original post by londongirl)
ok thank you

and i like ur sig
thanks! If you need anymore info just ask....i done the experiment twice....at G.C.S.E ( got A*) and AS Level (got A)
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#10
i know you said for 4cm it will have more surface area for osmosis to take place.. does this count for the different widths too then as well?
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14 years ago
#11
(Original post by londongirl)
i know you said for 4cm it will have more surface area for osmosis to take place.. does this count for the different widths too then as well?
yeah, if you want to make it a "fair" test then they must all be the same width!
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#12
yeh i know that. i am doing more than one experiment.. one will have different widths - to see what works best.
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14 years ago
#13
The go into this experiment in some depth in the CGP Biology Revision Guide. It might come in handy.
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