Question

If the osmotic pressure of a 0.010 M aqueous solution of sucrose at ${27}^{o}C$ is 0.26 atm, then the osmotic pressure of a 0.010 M aqueous solution of NaCl at ${27}^{o}C$ is:

• A. 0.062 atm
• B. 0.12 atm
• C. 0.25 atm
• D. 0.50 atm

Answer 1

The correct option is D 0.50 atm

Osmotic pressure, $\pi =iCRT$

For both the solution, all other conditions are similar except ${}^{\prime }{i}^{\prime }$ which is 1.0 for sucrose while 2.0 for $NaCl.$

$NaCl⟶N{a}^{+}+C{l}^{-}$

Therefore, osmotic pressure of $NaCl=2\times 0.25$

$=0.50$ atm

Hence, the correct option is $\text{D}$