Three cylinders of sweet potato were cut to equal lengths. One cylinder was placed in pure water, and the other two cylinders were placed in sucrose solutions of different concentrations.
The cylinders were left in the solutions for 30 minutes.
The table below shows the student's results.
| Solution | Starting mass in grams | Final mass in grams |
|---|---|---|
| Pure water | 2.10 | 2.25 |
| 0.2 mol/dm³ sucrose solution | 2.15 | 2.19 |
| 0.8 mol/dm³ sucrose solution | 2.12 | 1.95 |
Give one way the student could ensure that the measurements of the final mass of the cylinders are accurate.
