raisins swell when put in: (options rain water/saline water/ mustard oil/ saturated sugar solution
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Answered by
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Raisins swell when it is put in water, because of greater concentration of salt inside the resins and the amount of water is less.
Because of the presence of a low amount of water, it tends to move inside the resins.
Finally, it ends in endosmosis, and this is the reason why it swells.
Answered by
93
Thanks for the question!
It is definitely a very interesting question to solve and do some brainstorming.
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Raisins are put in
and are swelled up due to the action of 
and in general 
, a special type of diffusion occurring specifically in water molecules that are evenly performed through a semipermeable membrane or those membrane which allow only selective molecular diffusion and reject those which does not fit the criteria of it.
This happens because of the movement of water travelling from a higher chemical potential (basically found in pure state or dilute solution with less concentration and salts including higher water potential) to its lower chemical potential (basically found in solution with higher concentration and less water potential or a stronger solution with more amounts of slat concentration) without allowing the passing or the diffusion of solute by means of a semipermeable membrane. The chemical potential, here, in simple means, refers to the water potential or amount of water capability of carrying in a solution with solute concentration levels.
To elaborate and argue for my view, the experiment below (of resins) are showing the same fate of endosmosis by high water molecules and exosmosis by low water molecules, both having low and high concentrations respectively.
DEMONSTRATION OF ENDOSMOSIS AND EXOSMOSIS:
1) Apparatus (things needed in the following experiment):
A few grapes and raisins with intact (fixed) stalks, water, 10% salt solution, petri dishes or a cup.
Case 1: Place a few raisins in water for about 5-6 hours. Raisins will swell up. The swelling can be due to the absorption of water from the petri dish or cup.
Case 2:In another petri dish or cup place a few fresh grapes, (or swollen raisins) and pour the 10% salt solution into the dish. After a few hours the grapes will shrink or shrivel which can be possible only when they have lost water to the salt solution.
In the first case, the Raisins have absorbed the water from the outside due to the presence of higher concentration of solute in them (leads to turgidity of the cell or sweeping up which is good for a plant cell). This a classic example of endosmosis.
In the second case, the grapes have lost water to the salt solution because salt solution is more concentrated than the sap present in the grapes (leads to flaccidity of the cells or shrunkness and harmful to plant cell as the contents will come out). Therefore, it is an example of exosmosis.
Some Precautions:
1) Grapes and Raisins should be intact with stalks otherwise the experiment will not work as they also need roots and stalk for absorption (as a medium for it).
2) The solution for exosmosis must be stronger than the sap concentration present in the Grapes as, if it is not, then the experiment fails and they will remain at a normal state.
**************************************************
Hope it helps and solves your query!!
It is definitely a very interesting question to solve and do some brainstorming.
**************************************************
Raisins are put in
This happens because of the movement of water travelling from a higher chemical potential (basically found in pure state or dilute solution with less concentration and salts including higher water potential) to its lower chemical potential (basically found in solution with higher concentration and less water potential or a stronger solution with more amounts of slat concentration) without allowing the passing or the diffusion of solute by means of a semipermeable membrane. The chemical potential, here, in simple means, refers to the water potential or amount of water capability of carrying in a solution with solute concentration levels.
To elaborate and argue for my view, the experiment below (of resins) are showing the same fate of endosmosis by high water molecules and exosmosis by low water molecules, both having low and high concentrations respectively.
DEMONSTRATION OF ENDOSMOSIS AND EXOSMOSIS:
1) Apparatus (things needed in the following experiment):
A few grapes and raisins with intact (fixed) stalks, water, 10% salt solution, petri dishes or a cup.
Case 1: Place a few raisins in water for about 5-6 hours. Raisins will swell up. The swelling can be due to the absorption of water from the petri dish or cup.
Case 2:In another petri dish or cup place a few fresh grapes, (or swollen raisins) and pour the 10% salt solution into the dish. After a few hours the grapes will shrink or shrivel which can be possible only when they have lost water to the salt solution.
In the first case, the Raisins have absorbed the water from the outside due to the presence of higher concentration of solute in them (leads to turgidity of the cell or sweeping up which is good for a plant cell). This a classic example of endosmosis.
In the second case, the grapes have lost water to the salt solution because salt solution is more concentrated than the sap present in the grapes (leads to flaccidity of the cells or shrunkness and harmful to plant cell as the contents will come out). Therefore, it is an example of exosmosis.
Some Precautions:
1) Grapes and Raisins should be intact with stalks otherwise the experiment will not work as they also need roots and stalk for absorption (as a medium for it).
2) The solution for exosmosis must be stronger than the sap concentration present in the Grapes as, if it is not, then the experiment fails and they will remain at a normal state.
**************************************************
Hope it helps and solves your query!!
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