Question

Choose the correct option(s):
Here,
$w$ is mass of solute
$V$ is volume of the solution
$\pi$ is osmotic pressure of the solution
$T$ is temperature
$R$ is universal gas constant
$M$ is molecular mass of solute
$i$ is van't Hoff factor

• A. $M=\frac{wRT}{\pi V}$
• B. $M=\frac{\pi V}{wRT}$
• C. $i=\frac{\text{Experimental molar mass of the substance}}{\text{Theoretical molar mass of substance}}$
• D. Concept of osmotic pressure is used in dialysis.

Answer 1

Answer: (A), (D)

Concept of osmotic pressure is used in dialysis.

Application of osmotic pressure:
Determination of molecular mass of the solute.
$M=\frac{wRT}{\pi V}$
Here,
$w$ is mass of solute
$V$ is volume of the solution
$\pi$ is osmotic pressure of the solution
$T$ is temperature
$R$ is universal gas constant
$M$ is molecular mass of solute.

Widely used to determine molar masses of proteins and other biomolecules, as they are generally not stable at higher temperatures . This method has the advantage over other methods as pressure measurement is around the room temperature.

If solute gets associated or dissociated then theoretical molar mass of solute will be different from experimentally calculated molar mass.

$i=\frac{\text{Theoretical molar mass of the substance}}{\text{Experimental molar mass of substance}}$

Dialysis:
Dialysis removes the waste products and extra fluid from your blood by filtering them through a membrane/filter, similar to the way healthy kidneys would. During dialysis, blood is on one side of the membrane/filter and a special fluid called dialysate (containing water, electrolytes, and minerals) is on the other. Small waste products in your blood flow through the membrane/filter and into the dialysate.
Larger particles, like red blood cells, remain in your blood. In this way, your blood is cleaned.