4 A solution that is5 Molar HF has an osmotic pressure of 42

4. A solution that is.5 Molar HF has an osmotic pressure of 4.2 atmosphere at 37 degrees Celsjus Calculate the percent dissociation of HF at this concentration.

Solution

we know,

osmotic pressure = i * CRT

4.2 = i * 0.5 * 0.0821 * 310

i = 0.33

HA ........> H+ + A-

so number of ions (n) produce = 2

we know,

degree of dissociation = (i - 1) / (n - 1) = (1 - 0.33) / (2 - 1) = 0.67

% dissociation = 67 %