3. Osmosis

Question 1

pure water has

Answer 1

highest water potential

Question 2

isotonic solutions/

Answer 2

same water potential

Question 3

making solutions of different concentrations by finding scale factor
e.g. want to make 15 cm of 0.4 M from known conc of 1 1 M

Answer 3

concentration of solution / concentration of solution want to make
1/0.4=2.5 (solution you want to make is 2.5 times weaker)
use 2.5 cm less of it 15/2.5=6
+9=15cm

Question 4

how to use sucrose solution to find water potential of potato cells

Answer 4

1. cut potatoes into identical sizes
2. divide chips into groups of 3 and weigh
3. place each group into sucrose solutions
4. leave in solution for 20 mins
5. remove, gently dry, weigh & calculate % change in mass