The student weighed pieces of courgette and placed them in five different concentrations of sugar solution.
After one hour she dried and reweighed the pieces of courgette.
She calculated the percentage change in mass.

the concentration of sugar solution that would result in no change in mass is 0.4 moles per dm3
Explain why there was an increase in the mass of the courgette in the sugar solution at 0.2 moles per dm3.