Multiple Choice
Which of the following statements about osmosis is correct?
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14. Solutions
Osmosis
Multiple Choice
Which product is an example of an isotonic solution (approximately the same solute concentration as human blood plasma)?
A
0.9% (m/v) sodium chloride solution (normal saline)
B
10% (m/v) sodium chloride solution
C
Distilled water
D
5% (m/v) glucose solution
Verified step by step guidance1
Understand the concept of an isotonic solution: it has approximately the same solute concentration (osmolarity) as human blood plasma, which prevents net movement of water into or out of cells.
Recognize that human blood plasma has an osmolarity roughly equivalent to a 0.9% (m/v) sodium chloride (NaCl) solution, often called normal saline.
Evaluate each option by comparing its solute concentration to that of blood plasma: 0.9% NaCl matches closely, 10% NaCl is much more concentrated (hypertonic), distilled water has no solutes (hypotonic), and 5% glucose solution is isotonic but differs in solute type.
Recall that isotonic solutions maintain cell integrity by balancing osmotic pressure, so the correct choice is the solution with solute concentration closest to blood plasma, which is 0.9% (m/v) sodium chloride.
Conclude that 0.9% (m/v) sodium chloride solution is the example of an isotonic solution among the given options.
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