How can you remove the hard calcium carbonate layer of the egg without damaging its semipermeable membrane? Can this egg be inserted into a bottle with a narrow neck without distorting its shape? Explain the process involved.
How can you remove the hard calcium carbonate layer of the egg without damaging its semipermeable membrane? Can this egg be inserted into a bottle with a narrow neck without distorting its shape? Explain the process involved.
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1 Answer
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This is a long answer type question as classified in NCERT Exemplar
(i) When egg is placed in a dilute mineral acid solution (preferably dilute HCl solution), the hard external CaCO3 layer of the egg dissolves out /removed without damaging its semipermeable membrane.
(ii) Yes, this egg can be inserted into a bottle with a narrow neck without distorting in shape. The process involved utilising phenomenon of osmosis is explained as below -
Egg is placed in a mineral acid solution – after some time the egg is removed and placed in a hypertonic solution- size of the egg gradually decreases after some time and it shrivels due to o
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If a solution containing more than 0.9% salt is used, and we place blood cells in it, the water will flow out of the cells, and they will shrink. Such a solution is a hypertonic solution.
Similarly, if a solution contains less than 0.9% salt, the water will flow into the cells, and they will enlarge.
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