Question

The average osmotic pressure of human blood is 7.8bar at 310K.What is the concentration of an aqueous NaCl solution that could be used in the blood stream?

Answer 1

At a concentration of approximately `0.16M`, the aqueous solution of sodium chloride would not interfere significantly with blood pressure. Clearly there are many other factors at play, for the purpose of this question, this suffices.

Explanation:

`Pi = iMRT`

`i_(NaCl) = 1.9`

`7.8b ar * (atm)/(1.013b ar) approx 7.7atm`

`7.7atm = 1.9 * M * (0.08206L*atm)/(mol*K) * 310K`
`therefore M approx 0.16M`