2.45 g potato cork borer cylinders sucrose solution balance Table 1 shows the mass of potato cylinders after 40 minutes in sucrose solutions. Fig. 1 shows t...
Question 1 Report
Table 1 shows the mass of potato cylinders after 40 minutes in sucrose solutions. Fig. 1 shows the cylinders being cut with a cork borer. All cylinders had the same starting mass and came from the same potato, so their plant cells were similar at the start.
| Sucrose concentration / mol dm-3 | Mean percentage change in mass / % |
|---|---|
| 0.00 | +12 |
| 0.20 | +4 |
| 0.40 | -1 |
| 0.60 | -9 |
(a) What is the percentage change in mass at 0.60 mol dm-3? [1]
(b) Describe the result for the cylinder in pure water. [1]
(c) Give the approximate sucrose concentration at which there is no net movement of water. [2]
Answer Details
(a) The percentage change in mass at \(0.60\text{ mol dm}^{-3}\) is \(-9\%\). [1]
(b) In pure water, the potato cylinder’s mass increases by \(12\%\). [1]
(c) No net movement occurs where the percentage mass change is zero. This lies between \(0.20\text{ mol dm}^{-3}\), where mass increased by \(4\%\), and \(0.40\text{ mol dm}^{-3}\), where mass decreased by \(1\%\). An appropriate estimate is about \(0.38\text{ mol dm}^{-3}\); \(0.4\text{ mol dm}^{-3}\) is also accepted. [2]
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