LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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water and starch
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starch and glucose
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iodine and starch
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glucose and iodine
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Detailed explanation-1: -If a dialysis bag filled with water is placed in a starch solution, what do you predict will happen to the weight of the bag over time? Why? The dialysis bag will gain water, making it weigh less because water moves from an area of high concentration to lower.
Detailed explanation-2: -– The water solution of iodine around the starch dialysis tubing was the color of iodine, not the purple color for the iodine-starch test. Therefore, starch molecules did not travel through the dialysis tubing. However, there is a purple-black color inside the tubing.
Detailed explanation-3: -If a cell is placed in a hypertonic solution, there will be a net flow of water out of the cell, and the cell will lose volume. A solution will be hypertonic to a cell if its solute concentration is higher than that inside the cell, and the solutes cannot cross the membrane.