Question

a solution containing 1.9 gram per hundred ml of KCL is isotonic with a solution containing 3 gram per hundred ml of Urea calculate the degree of dissociation of KCL solution assume that both the solution have same temperature ​

Answer 1

Isotonic solutions are those solutions which have the same osmotic pressure.

if osmotic pressures are equal at the same temperature, concentrations must also be equal.

= osmotic pressure

C= concentration

R= solution constant

T= temperature

Thus: where concentration is in molarity.

For non electrolyte urea solution: 3 g of urea is dissolved in 100 ml of solution.

For electrolyte KCl : 1.9 g of  KCl is dissolved in 100 ml of solution.

As

Formula used :

where,

n = number of particles after dissociation = 2

Now we have to calculate the percentage dissociation.

Therefore, the percentage dissociation of is 100%