Q44 / 200 · Manipal (MET) 2014 · Chemistry

If the osmotic pressure of a 0.010 M aqueous solution of sucrose at $27^{\circ} \mathrm{C}$ is 0.25 atm , then the osmotic pressure of a 0.010 M aqueous solution of NaCl at $27^{\circ} \mathrm{C}$ is

  • A
    0.062 atm
  • B
    0.12 atm
  • C
    0.25 atm
  • Correct answer
    D
    0.50 atm

Solution

Osmotic pressure $=i C R T$, For both the solutions, all other conditions are similar except 'i' which is 1.0 for sucrose while 2.0 for NaCl .
Therefore, osmotic pressure of NaCl $\begin{aligned} & =2 \times 0.25 \\ & =0.50 \mathrm{~atm} \end{aligned}$

Hence, the correct answer is option: 'D'.

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