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Potato disc, water potential?

Can someone please help with this question? I have attached the mark scheme as well. I do get the gist of things here but I am still a bit confused with finding the water potential. Will really appreciate it someone could help!
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Reply 1
Avatar for Joel TJ
Joel TJ
8
It’s just a fancy word for water diffusion
Reply 2
Avatar for sienna2266
sienna2266
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Original post by Joel TJ
It’s just a fancy word for water diffusion


Thanks I understand that but how do you do the question?
Reply 3
Avatar for sienna2266
sienna2266
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Bump
so you would plot a graph of concentration of Sucrose soln against change in mass of the potato discs. where the change in mass is 0, the solutions must be the same concentration so just read off your graph the concentration :smile:
Reply 5
Avatar for sienna2266
sienna2266
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Original post by BeccaHeritage
so you would plot a graph of concentration of Sucrose soln against change in mass of the potato discs. where the change in mass is 0, the solutions must be the same concentration so just read off your graph the concentration :smile:


Thanks so much for your reply back :smile: But then this works out the concentration of the potato tuber dics and the concentrationn of the sucrose solution - how would you work out the water potential from this? Many thanks
Reply 6
Avatar for HateOCR
HateOCR
22
I remember this OCR qn hahaha
Original post by sienna2266
Thanks so much for your reply back :smile: But then this works out the concentration of the potato tuber dics and the concentrationn of the sucrose solution - how would you work out the water potential from this? Many thanks


ah I think you just look it up (if you look at the very bottom of the mark scheme) :smile:
Reply 8
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sienna2266
OP
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Original post by BeccaHeritage
ah I think you just look it up (if you look at the very bottom of the mark scheme) :smile:


Ohh thank you so much! :smile: So would something along the lines of "look up the water potential of the sucrose solution at the sucrose concentration which gives no mass change to the potato disc on a table/calibration curve where x axis represents sucrose concentration and y axis represents water potential"
Could you please kindly let me know if this would be ok for the last point? Many thanks :smile:
Feel free to change it around cause I am trying to reduce the amount of waffling in my answers:biggrin:
(edited 6 years ago)
Original post by sienna2266
Ohh thank you so much! :smile: So would something along the lines of "look up the water potential of the sucrose solution at the sucrose concentration which gives no mass change to the potato disc on a table/calibration curve where x axis represents sucrose concentration and y axis represents water potential"
Could you please kindly let me know if this would be ok for the last point? Many thanks :smile:


yeah sounds good!!
Original post by BeccaHeritage
yeah sounds good!!


Thanks so much! Really appreciate the help:smile::smile:

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