Question

Calculate the osmotic pressure of a decinormal solution of $NaCl$ which is ionised to $80\%$ at ${27}^{o}C$?

• A. $4.43$ atm
• B. $0.443$ atm
• C. $0.222$ atm
• D. $0.111$ atm

Answer 1

The correct option is A $4.43$ atm

We have

$\pi =iCRT$

and $i=1+(n-1)\alpha$

where,

$n=2,$ $\alpha =0.8$

$i=1+(2-1)0.8=1.8$

On putting the values, we have

$\pi =1.8\times 0.1\times 0.082\times 300$

$\pi =4.43atm$

Option A is correct.