An investigator researched the effect of varying concentrations of glucose solution on the mass of sweet potato (Ipomoea batatas) cylinders.
The following procedure was used:
The table below displays the results of the investigation:
| Concentration of glucose solution (mol dm−3\text{mol dm}^{-3}mol dm−3) | Initial mass of cylinder (g\text{g}g) | Final mass of cylinder (g\text{g}g) |
|---|---|---|
| 0.0 (distilled water) | 3.20 | 3.68 |
| 0.2 | 3.50 | 3.71 |
| 0.4 | 3.40 | 3.40 |
| 0.6 | 3.60 | 3.24 |
| 0.8 | 3.00 | 2.55 |
Calculate the percentage change in mass of the sweet potato cylinder placed in the 0.6 mol dm-3 glucose solution. Show your working.
Explain, in terms of water potential and osmosis, why the sweet potato cylinder in distilled water (0.0 mol dm-3) gained mass, whereas the cylinder in 0.6 mol dm-3 glucose solution lost mass.