Question

The average osmotic pressure of human blood is 7.8 bar at 37⁰C. What is the concentration of an aqueous NaCl solution that could be used in the bloodstream

• A. 0.16 mol/L
• B. 0.32mol/L
• C. 0.60mol/L
• D. 0.45mol/L

Answer 1

The correct option is

C

0.15mol/L

Given that,

The average osmotic pressure $\left(\pi \right)$ of human blood is 7.8 bar at $37C^0\left(310K\right)$

NaCl is a strong electrolye i.e. it will dissociate 100%

$NaCl⟶N{a}^{+}+C{l}^{-}$

i = 2

The concentration of an aqueous NaCl solution (C) =?

$\pi =CRT.i$

$C=\frac{7.8}{0.0821\times 310\times 2}=\frac{0.51mole}{L}$

Therefore, The concentration of an

aqueous NaCl solution that

is used in blood stream

is 0.15 mol/L.