Question

The pH of a 0.1M monobasic acid is found to be 2. Hence, its osmotic pressure at a given temperature T is:

• A. \(0.1RT\)
• B. \(0.11RT\)
• C. \(1.1RT\)
• D. 0.01RT

Hint:

Weak electrolytes require van’t Hoff factor correction.

Answer 1

The Correct Option is B

Step 1: pH = 2 ⇒ [H⁺]=10⁻2.
Step 2: Degree of ionisation: α=frac10⁻20.1=0.1
Step 3: van’t Hoff factor: i=1+α=1.1
Step 4: π=iCRT=0.11RT