Question

12.89 A 0.100-M aqueous solution of the base HB has an osmotic pressure of 2.83 atm at 25°C. Calculate the percent ionization of the base. (12.6) 12.90 What are colloids? Referring to Table 13.5, why is there no colloid in which both the dispersed phase and the dispersing medium are gases? (12.7)

Answer 1

12.89) Given is pressure= 2.83 atm. Temperature 25°c= 298k concentration= 0.1M and HB gives 2 ions in water

We know π = icRT

Putting the values

2.83= i×0.1×0.0821×298

i= 1.13

Now for extent of dislocation

i= 1-x+nx. Where n is no ions and X is % dissociation

1.13= 1-x+2x

1.13= 1+X

X= 0.13 so ans is 13%

% dissociation is 13%

12.90) A mixture of two substances in which one substance is divided into minute particles i.e. colloidal particles (ranging from 1 to 1000 nm in diameter) and dispersed or suspended over another substance. These insoluble particles are inseparable either by filtering or centrifuging.

When the gases are mixed it forms a mixture of homogenous gas atoms, here the dispersed phase is gas and the dispersion medium is also gas, which can be called as solution rather than colloidal system as the mixture of gases forms translucent and transparent medium.