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Chemistry / Chemistry 11 / Chapter 12 / Problem 76P

Chemistry | 11th Edition | ISBN: 9780073402680 | Authors: Raymond Chang

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Solution: Both NaCl and CaCl2 are used to melt ice on roads

Chapter 12, Problem 76P

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QUESTION:

A 0.86 percent by mass solution of NaCl is called “physiological saline” because its osmotic pressure is equal to that of the solution of blood cells. Calculate the osmotic pressure of this solution at normal body temperature (37°C). Note that the density of the saline solution is 1.005 g/mL.

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QUESTION:

A 0.86 percent by mass solution of NaCl is called “physiological saline” because its osmotic pressure is equal to that of the solution of blood cells. Calculate the osmotic pressure of this solution at normal body temperature (37°C). Note that the density of the saline solution is 1.005 g/mL.

ANSWER:

Step 1 of 2

Here we are asked to calculate the osmotic pressure of the solution.

The osmotic pressure of a solution is the pressure required to stop osmosis. The osmotic pressure of a solution is given by

where is the molarity of solution, is the gas constant ( . atm/ . mol), and is the absolute temperature. The osmotic pressure, , is expressed in atm. Because osmotic pressure measurements are carried out at constant temperature, we express the concentration in terms of the more convenient units of molarity rather than molality.

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