Question

The average osmotic pressure of human blood is $7.8$ bar at $37^{\circ}\, C$. What is the concentration of an aqueous $NaCl$ solution that could be used in the blood stream?

• A. 0.16 mol/L
• B. 0.31 mol/L
• C. 0.60 mol/L
• D. 0.45 mol/L

Answer 1

Answer: (B)

0.31 mol/L

Answer 2

We know that, $\pi=C R T$ $C=\frac{\pi}{R T} =\frac{7.8}{0.0831 \times(273+37)}$ $=\frac{7.8}{0.0831 \times 310}=0.30 \,mol / L$