Find the freezing point of a solution when 5 moI of Kl is mixed with 1 moI of HgCI2 in 3500 g of H20. Kf of H20 1.86 K/m. (KI + HgCI2 --> K2Hgl4 + KCI)

First find the composition of solution after reaction.

What is Gold number of protective colloidal solution?

Lyophilic sols are more stable than lyophobic sols.this is due to the fact that lyophilic colloids are extensively solvated, i.e. colloidal particles are covered by a sheath of the liquid in which they are dispersed.

Lyophilic colloids have a unique property of protecting lyophobic colloids. When a lyophilic sol is added to the lyophobic sol, the lyophilic particles form a layer around lyophobic particles and, thus, protect the latter from electrolytes.

Lyophilic colloids used for this purpose are called protective colloids.

The lyophilic colloids differ in their protective power. The protective power is measured in terms of Gold Number and is defined as the number of milligrams of a lyophilic colloid that will just prevent the precipitation

of 10 ml of a gold sol on the addition of 1 ml of 10% sodium chloride solution.

Lyophilic sols are more stable than lyophobic sols. Why ?

Lyophilic sols are more stable than lyophobic sols.this is due to the fact that lyophilic colloids are extensively solvated, i.e. colloidal particles are covered by a sheath of the liquid in which they are dispersed.

Lyophilic colloids have a unique property of protecting lyophobic colloids. When a lyophilic sol is added to the lyophobic sol, the lyophilic particles form a layer around lyophobic particles and, thus, protect the latter from electrolytes.

Lyophilic colloids used for this purpose are called protective colloids.

Give some examples of common negatively charged colloidal solution?

The common negatively charged colloids are given below:

As2S3 sol,

Sb2S3 sol, 

CdS sol, 

Au sol, 

Cu sol, 

Ag sol 

And acid dyes like

congo red.

Give some examples of common positively charged colloidal solution?

The common positively charged colloids are given below:

Fe(OH)3 sol, 

Cr(OH)3 sol,

Al(OH)3 sol, 

Ca(OH)2 sol, 

And also dyes like methylene blue and haemoglobin.