pag potato cylinders

Question 1

outline method

Answer 1

• use cork borer to cut potato cylinders of same diameter
• use scalpel and ruler to cut the cylinders into same length
• measure mass of each cylinder
• use same volume but different concentration of sugar solution in each test tube, and one water tube
• one cylinder in each tube for same length of time
• remove potatoes, pat dry and record final mass
• calculate percentage mass change
• graph of sugar conc against percentage mass change
• sugar conc where line crosses x axis equals sugar conc of potato

Question 2

control variables

Answer 2

• volume of solution
• time left in solution
• size of potato cylinders
• temp

Question 3

limitations

Answer 3

• excess water may not be absorbed equally before weighing

- discs may have different SA

Question 4

how to improve accuracy

Answer 4

smaller and more intervals around conc where mass change is 0%