What is the difference solution and suspension?
1. Solutions are mixtures that are homogeneous while suspensions are mixtures that are heterogeneous. 2. The particles of a solution are at the ion or molecular level and cannot be seen by the naked eye while the particles of a suspension can be seen by the naked eye.
What are the 2 components of a solution?
Solutions are made up of two parts: a solvent and a solute. Solvent – The component that dissolves the other component is called the solvent. Solute – The component that is dissolved in the solvent is called solute.
What are the uses of colloids?
A colloid is used as thickening agents in industrial products such as lubricants, lotions, toothpaste, coatings, etc. In the manufacture of paints and inks, colloids are useful. In ball-point pens, the ink used is a gel (liquid-solid colloid).
What are emulsions what are their different types?
ii) Water-in-oil emulsion (W/O) : The emulsion in which water forms the dispersed phase, and the oil acts as the dispersion medium is called a water-in-oil emulsion. These emulsions are also termed oil emulsions. Butter and cold cream are typical examples of these types of emulsions.
What is tanning of leather explain Class 12?
Tanning – Animal hides are colloidal in nature. When a hide that has positively charged particles is soaked in tannin/chromium salts, which contains negatively charged particles , mutual coagulation takes place. This results in the hardening of leather. This process is termed as tanning.
Why the leather gets 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 cogulation and gets harden . Thus, leather get hardened after tanning.
Why does leather get hard after tanning Class 12?
Leather gets hardened after tanning. Animal skin (hide) is colloidal in nature and has positively charged particles, whereas tanning consists of negatively charged colloidal particles. When a hide is soaked in tanning, mutual coagulation takes place and as a result, leather gets hardened.
Which one of the following is used in hardening of leather?
Hardening of leather in tanning industry is based on (C) Mutual coagulation. – The chemical used in process of tanning is known as Tannin. – It contains negatively charged colloidal particles whereas leather contains positively charged colloidal particles.
Why vegetable tanned leather Cannot adsorb a large amount of moisture?
The leathers tanned with vegetable tanning materials have smaller surface areas since they are composed of less hide substance and the capillaries are reduced to smaller diameters, in some cases probably completely filled by tanning materials.
What is tan colloid?
When a skin, which has positively charged particles, is soaked in tannin, which contains negatively charged colloidal particles, mutual . coagulation takes place. This results In the hardening of skln weather). Thls process is termed as tanning. Chromium salts are also used In place of tannin.
Can tanning of leather cause coagulation?
(ii) In tanning the positively charged colloidal particles of hides and leather are coagulated by impregnating, them in negatively charged tanning materials (present in the barks of trees).