How do emulsifying agents stabilise the emulsion?
Emulsifying agents stabilise the emulsion by forming an interfacial layer between suspended particles and the dispersion medium. e.g., gelatin is added to ice cream to stabilise it.
Why are some medicines more effective in the colloidal form?
Some medicines are more effective in colloidal form because they have large surface area so easily assimilated in the body.
Why does leather get hardened after tanning?
Animal hide is colloidal in nature and has positively charged particles. When it is soaked in tanin (negatively charged), a colloid, it results in mutual coagulation and gets harden. Thus, leather get hardened after tanning.
How does the precipitation of colloidal smoke take place in Cottrell precipitator?
In Cottrell precipitator, smoke particles (charged) are passed through a chamber containing plates with charge opposite to the smoke particles, smoke particles lose their charge on the plates and get precipitated.
How will you distinguish between dispersed phase and dispersion medium in an emulsion?
To distinguish between dispersed phase and dispersion medium we increase the concentration of any one dispersion medium or dispersed phase then notice the change. When dispersion medium is added to an emulsion, it gets diluted to any extent. But on adding dispersed phase it forms a separate layer, if added in excess.