# Osmotic Pressure Difference.

Brackish water with a salt content around .5 percent by mass is found in semiarid regions such as the American Southwest. Assuming that brackish water has the same density as pure water and contains only sodium chloride, estimate the osmotic pressure of brackish water at 298K.

A hint is that the the total molarity is the sum of the molarities of Na+ and Cl-.

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#### Solution Preview

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Before you look at the solution you might want to try to solve the problem using these steps:

The osmotic pressure is defined as

P=CRT where C is the concentration of the solute, R=0.0821 is a constant and T is the temperature in kelvin.

1. To find the pressure we need to find the ...

#### Solution Summary

The expert examines osmotic pressure. The total molarity with a sum of the molarities is determined.