Question

Which of the following will exert greater osmotic pressure -0.1M NaCl or 0.1 M glucose ? Give reason for your answer

Answer 1

$NaCl \to Na^++Cl^-$

$i($ Vant Hoff factor $)$ for $NaCl=2$

while Glucose being an organic covalent compound ,so it does not dissociate in water.

Vant Hoff factor for glucose$=1$

Osmotic pressure for glucose$=iCRT=1\times 0.1 \times RT=0.1RT$

Osmotic pressure for $NaCl=iCRT=2\times 0.1\times RT=0.2RT=$ Twice of that of glucose.

Hence osmotic pressure for sodium chloride is double of that of glucose