Question

calculate the van't Hoff Factor for HF if the freezing point of a 0.50m aqueous solution has a freezing point of -1.00°c.​

Answer 1

To find:

Van't Hoff Factor for HF if the freezing point of a 0.50m aqueous solution has a freezing point of -1.00°C.

Calculation:

So, depression in freezing point be ∆T :

$\Delta T = 0 - ( - 1) = {1}^{ \circ} C$

Now, let Van't Hoff Factor be 'i':

$\Delta T = i \times m \times k_{f}$

• k_(f) value [molal freezing depression constant] for aqueous solutions is 1.86 °C/m

$\implies \: 1 = i\times 0.5\times 1.86$

$\implies \: 1 = i\times 0.93$

$\implies \: i = \dfrac{1}{0.93}$

$\implies \: i = 1.07$

So, Van't Hoff Factor is 1.07.