osmosis practical

Question 1

step 1
why

Answer 1

peel potato skin because it is impermeable

Question 2

step 2
why

Answer 2

cork borer- produce three potato cylinders
so they’re the same diameter

Question 3

step 3
why

Answer 3

use a knife and ruler to cut potatos to 3cm check if its 3cm with ruler
shorter cylinders do not allow us to measure effects of osmosis

Question 4

step 4

Answer 4

balance - measure mass of cylinder and record in table

Question 5

step 5

Answer 5

add potatos into test tube
10cm^3 of each solution
leave overnight for osmosis to occur

Question 6

what are the solution levels

Answer 6

0.0 (distilled water), 0.25 sugar, 0.5 sugar

Question 7

stage 6
why

Answer 7

remove potatos and blot them gently to remove excess water so they dont affect the results

Question 8

stage 7

Answer 8

measure and record new length and mass and calculate percentage change

Question 9

what happens when the potato is in distilled water

Answer 9

potato gains mass since water moves in

Question 10

what happens in potato is in sugar solution

Answer 10

potato loses mass as water moves out

Question 11

how do you know there’s no change in mass on a graph

Answer 11

when the line crosses the x axis