Filters

Q&A - Ask Doubts and Get Answers
Q

Please help! - is 40 % ionised in aqueous solution. The value of its van't Hoff factor (i) is : - Solutions - JEE Main

$K_{2}HgI_{4}$ is 40 % ionised in aqueous solution.

The value of its van't Hoff factor (i) is :

• Option 1)

2.2

• Option 2)

1.8

• Option 3)

2.0

• Option 4)

1.6

Answers (1)
Views

Vant Hoff factor (i) -

In case of electrolytes the observed colligative property is different from theoritical colligative property. There ratio is defined by Vant Haff factor

- wherein

$i = \frac{observed}{theoritical}$

$K_{2}[HgI_{4}]\rightarrow 2K^{+}+[HgI_{4}]^{2-}\: \: \: ;n=3$

$i = 1+3(3-1)\times 0.4$

$i = 1+2\times 0.4=1.8=1.8$

Vant Hoff factor for dissociation -

$i= 1+(n-1)\alpha$

Where

$n$ is the no. of dissociated particles

$\alpha =$ degree of dissociation

- wherein

$NaC l \: \: \: n = 2$

$CaCl_{2} \: \: \: n = 3$

$K_{4}[F(CN_{6})]\: \: \: \: \: n=5$

Vant Hoff factor for Association -

$i=1-\alpha +\frac{\alpha }{n}$

$n=$ number of particles associated

$\alpha =$ degree of association

e.g. Carboxylic acid dimerized in non polar solvents like Hexane.

- wherein

n = 2 for dimerization

n = 3 for trimerization

Option 1)

2.2

Option 2)

1.8

Option 3)

2.0

Option 4)

1.6

Exams
Articles
Questions