A group students investigated the effect of soaking small onion bulbs in different concentrations of sodium chloride solution. They peeled off the outer papery leaves of the onions bulbs and divided the onions into 6 batches, each with 10 onions. The onions were surface dried with paper towels and weighed. The mean mass of the onions in each batch was calculated. The onions were then left in sodium chloride solutions for three hours. After 3 hours the students surface dried the onions and weighed the again. Their results are given in the table below. Table 2.1 Using the term water potential explain why the onion: Gained mass when soaked in dilute solutions of sodium chloride. Lost mass when soaked in dilute solutions of sodium chloride.
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There is swelling of the onion when placed in normal water and there is shrinking of the onion when placed in highly concentrated solution of sodium chloride.
Explanation:
- This is due to the process of osmosis. Osmosis is the movement of water from the region of lower concentration to the region of higher concentration across a semipermeable membrane.
- Here when the concentration of water is increased in comparison to that of the onions there is is exosmosis or removal of water from the onion.
To know more about osmosis,
Define osmosis . In which two ways it is different from diffusion ...
https://brainly.in/question/1183050
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