Q.1 How can we distinguish between a Colloidal and a True solution. Explain with the help of a diagram? Q.2 Write the dispersion medium and dispersed phase in smoke, fog and cloud. Q.3 Colloidal solution appears to be homogeneous but it is heterogeneous. Explain Q.4 Select the Colloidal solution from: Soap + water; salt+ water; sand + water; fog
Answers
The answer to given questions are as follows -
A1 - True solution is a mixture of homogenous particle which dissolve easily making the solution transparent. Colloidal solution is a mixture of heterogeneous mixture, which don't dissolve and hence form translucent or opaque solution.
A2 - In smoke, dispersion medium is gas while dispersed phase is solid.
In fog, dispersion medium is gas while dispersed phase is liquid.
In cloud, dispersion medium is gas while dispersed phase is liquid.
A3 - Colloidal solution is a heterogeneous mixture due to presence of different sized particles present in the solution. The solution appears to be homogenous due to very small size of small particles, which is not visible by naked eye.
A4 - Colloidal solution from given options is - soap + water mixture and fog.
The particles in the colloidal solution are visible through the electron microscope, but not through the naked eye. Particles in the colloidal solution show Brownian movements. The suspension is the mixture, where the solute does not get dissolved, rather get suspended in the liquid and float freely in the medium.