A student investigated the effect of the concentration of sodium chloride solution on the mass of butternut squash discs.
Figure 1 shows the results.

Plan a method that could be used to obtain the results in Figure 1.
Explain the result for the butternut squash discs in the 0.6 mol/dm30.6 \text{ mol/dm}^30.6 mol/dm3 sodium chloride solution.
Explain why the percentage loss in mass at 0.6 mol/dm30.6 \text{ mol/dm}^30.6 mol/dm3 was greater than the percentage loss in mass at 0.4 mol/dm30.4 \text{ mol/dm}^30.4 mol/dm3.