Solutions Question 373
Question: A solute X has a solubility of 10.0 g in 100 g of water at $ 25{}^\circ C. $ If a solution containing 4.0 g of solute in 50 g of water is subjected to evaporation at constant temperature of $ 25{}^\circ C $ , the osmotic pressure of the solution
Options:
A) remains unchanged throughout
B) increases continuously
C) increases to constant value
D) decreases to constant value
Show Answer
Answer:
Correct Answer: C
Solution:
The given solution is unsaturated (saturated one contains 5 g of solute in 50 g of water). On evaporation, concentration of solution increases to saturation and thereafter becomes constant due to excess solid separating out. Hence, osmotic pressure first increases and then becomes constant.
