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why dried raisins placed in water swell up

because of osmosis

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Dried raisins have lesser or no concentration of water in it. When it is placed in water, water has more concentration. So dried raisins acquire water from the surrounding solution due to the process of osmosis (endosmosis).

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 Dried raisins when kept in pure water swell up after some time due to endosmosis . The concentration of solutes in raisins is more than the outside so water move inside the raisin resulting in its swelling. Raisinsshrink in concentrated saline water due to exosmosis . As the concentration of solute is more outside i.e. in saline water as compared to raisin, so it looses water and shrinks to attain equilibrium.

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thank yoouuu!

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Dried raisins when kept in pure water swell up after some time due to endosmosis . The concentration of solutes in raisins is more than the outside so water move inside the raisin resulting in its swelling.
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These swollen raisins are due to endo-osmosis.
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Dried raisins when kept in pure water swell up after some time due to endosmosis
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When the raisins are kept in water they swell due to a process called endosmosis
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Concenteration of water was less in raisins so with process of osmosis the water outside the cell came in because the particles go from a region of high concenteration to a region of low concenteration
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they swell up
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The dried rasins when put in water because the experience a condition called Osmosis(movement of water from a region of higher concentrationto a region of lower concentration). The cell has more solutes . So the water(solvent) moves inside through the cell membrane by endosmosis . This is the reason
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Dried rasins when kept in water swell.up becausethey absorb water through the process osmosis.
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Dried rasins when kept in water swell up because they absorb water by endosmosis. This solution is called hypertonic solution.
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due to endosmosis 
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Raisins are dry fruits, they are deliberately dehydrated which automatically decreases the dilutacy or water concentration of raisins.....
Endo-osmosisement or movement of water from outside the raisins to the inside of the raisins cause them to swell up (there is a semi-permeable plasma membrane outside each cell which leads to this.....)
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