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4. Weigh the raisins again(W2) and find the difference between W1 and W2.
Observation:
• Raisins swell up due to endosmosis.
• Some swollen raisins can be placed in concentrated sugar or salt solution.
After 15-30 minutes, the raisins will shrink to previous form. It is due to
exosmosis.
Mass percentage of water imbibed by raisins can be calculated as:
Mass of water absorbed by raisins
Mass % of water imbibed= x 100
Initial mass of raisins
Activity Work Sheet 3
1. Suggest the type of solution in which the swollen raisins will shrink again.
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2. What will happen if the raisins are dipped in a hypotonic solution?
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3. What will happen to the raisins if they are kept in isotonic solution?
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4. What is the effect of temperature on the rate of imbibition?
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5.Have you experienced difficulty in closing wooden doors during rainy season? Give
a suitable explanation.
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6.Mention any two precautions that are to be taken for performing the above activity.
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