Question
Mon February 25, 2013 By: Mrudula

If X represents weight of soaked raisins and Y represents weight of dry raisins then (x -y)/y * 100 is a way to calculate the percentage of what? A. water absorbed by raisins in hyppertonic solution B. water absorbed by raisins in hypotonic solution c. water lost by raisins in hypotonic solution D. water lost by raisins in hypertonic solution Which of the four options is correct and why? What is a hypertonic and hypotonic solution?

Expert Reply
Tue February 26, 2013
b)
 
When dry raisins are placed in hypotonic solution, they absorb water due to endosmosis.

Hypertonic solution is a solution that has higher osmotic pressure (or has more solutes) than another solution to which it is compared. When a cell’s cytoplasm is bathed in a hypertonic solution the water will be drawn out of the cell and into the solution by osmosis.

 

Hypotonic solution refers to any solution which has a lower osmotic pressure than another solution (that is, has a lower concentration of solutes than another solution). If the solution surrounding the cell is hypotonic, osmosis causes water to have a net flow into the cell, thus, resulting in the swelling and expansion of the cell.

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