Question

A $5.85\%$ (wt/vol) $NaCl$ solution will exert an osmotic pressure closet to which one of the following.

• A. $5.85\%$ (wt/vol) sucrose solution
• B. $5.85\%$ (wt/vol) glucose solution
• C. $2$ m sucrose solution
• D. $1$ m glucose solution

Answer 1

The correct option is C $2$ m sucrose solution

for the osmotic pressure of solution to be some

their (concentration van'tt thoff factor) must be same.

5.85% wt/vol $NaCl=\frac{58.5}{1000}wt/volNaCl=1MNaCl$

iNacl = 2 (because NaCl is a strong electrolyte and dissociates to $N{a}^{+}$ and $C{l}^{(-)})$

$\Rightarrow$ effective $C_{NaCl}=1M\times 2=2M$

Ans C: 2 m sucrose and i = 1 (because no dissociation occurs for sucrose)

effective $C_{NClose}=2M\times 1=2M$

Since effective concentration of NaCl and sucrose are same

they, they have same osmotic pressure.