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Question
Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells in a solution containing
(i) 1.2% sodium chloride solution?
(ii) 0.4% sodium chloride solution?
Solution
(i) 1.2% sodium chloride solution is hypertonic wrt 0.9% sodium chloride solution. Therefore, when the blood cells are placed in 1.2% sodium chloride solution, water flows out of the cells and the cells shrink.
(ii) 0.4% sodium chloride solution is hypotonic wrt 0.9% sodium chloride solution. Therefore, when the blood cells are placed in 0.4% sodium chloride solution, water flows into the cells and the cells swell.
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