A complex is represented as CoCl3.xNH3.Freezing point of its 0.1 molar solution is - 0.558° C (Kf = 18.6) Assuming 100 % dissociation and coordination number of Co(iii) is six , the what is the complex formula ?

We can find the formula of Complex by :

A complex is wrltten as M(en)y.xBr. lts 0.05 molar solution shows 2.46 atm osmotlc pressure at 27°C. Assuming 100 % ionisaton and coordination number of metal (iii) is six, complex may be:

The Complex is M(en)y.xBr. and given c= 0.05 M, osmotlc pressure = 2.46 atm and The= 300K.

We know that osmotlc pressure (π)= icRT

Where To is universal gas constant = 0.0821j/mole per K

Then I = π/ cRT = 2.46/0.05×0.0821×300

                           =2 

  The vant Hoff facter's is (2) means their is two ions furnish after dissociation of Complex since  coordination number is (6) and van't hoff facter is (2) then formula of Complex is :

[M(en)2Br2]Br --> [M(en)2Br2]+  +Br- 

A non Stoichiometric oxide of iron represented as Fe_x O_1.0 , contains one Fe+3 for every three Fe+2 ions , then find the value of x is...

Given that one Fe+3 for every Fe+2 and total ions of Fe+3 and Fe+2 is equal to "x"  then number of Fe+3 is x/4 and Fe+2 is equal to 3x/4.

Finally we can calculate the value of x by balancing Oxidation state of Compound, given as :

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.