A student cut three potato cylinders and weighed each one.
The cylinders were placed in 50 cm3^{3}3 of a 0.4 mol/dm3^{3}3 sucrose solution.
After two hours, the student weighed each cylinder again. The results are shown below.
| Potato cylinder | Mass at the start in grams | Mass after two hours in grams | Change in mass in grams |
|---|---|---|---|
| A | 3.5 | 3.1 | -0.4 |
| B | 3.6 | 3.1 | -0.5 |
| C | 3.4 | 2.9 | -0.5 |
Give one reason why the student used three potato cylinders instead of just one potato cylinder.
