Q- List two precautions to be taken while you determine the mass percentage of water imbibed by raisins. State the inference drawn from this experiment.
Answer- The two main precautions to be taken while we determine the mass percentage of water imbibed by raisins are as follows:
1. The raisins we had taken for this experiment should clean as well as dry and should have intact stalks.
2. Gently remove the extra water of the swollen raisins by placing them on a blotting paper.
The Inference drawn through this experiment is:
Swelling of dry raisins when paced in water proves the phenomenon of imbibitions which is the process of adsorption of water by substances without forming a solution.
The four main steps of the method involved in an experiment on determining the percentage of water absorbed by raisins in the laboratory are as follows:
1. Weight some dry raisins and note down their weight before putting them in water (W1).
2. Keep the dry raisins in a petridish containing plain water for 1 to 2 hours. Raisins swell up due to the process of endosmosis.
3. After 1 to 2 hours remove those raisins from water in petridish and again weight them after getting swellen (W2).
4. Now the last step is to calculate the percentage of water absorbed by raisins after 1 to 2 hours dipped in water.