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Question

I'm confused with diffusion and its properties and osmosis and its properties. Please solve my doubt.

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Solution

  • diffusion and its properties
Diffusion is the movement of a fluid from an area of higher concentration to an area of lower concentration. Diffusion is a result of the kinetic properties of particles of matter. The particles will mix until they are evenly distributed.
Properties

The constituent particles in solids are very closely packed. Hence diffusion occurs rarely in solids as particles in two solids cannot intermix with each other. Solids can diffuse into liquids and gases comparatively easier than into solids. There are examples in which solid can diffuse into solid such as formation of alloys.

The rate of diffusion of liquids is higher than that of solids. This is due to the fact that in the liquid state, particles move freely and have greater space between each other as compared to particles in the solid state.

However, the rate of diffusion is maximum in gases, as spaces between the constituent particles of gases are larger as compared to both liquids and solids.

  • osmosis and its properties
Osmosis is the process of passage of water across a semipermeable mambrane(semipermeable mambrane is a mambrane that will allow certain molecules or ions to pass through it by diffusion) from an area where there are more water molecules to an area where there are less.

Properties

If two solutions of different concentration are separated by a semi-permeable membrane which is permeable to the smaller solvent molecules but not to the larger solute molecules, then the solvent will tend to diffuse across the membrane from the less concentrated to the more concentrated solution. This process is called osmosis.

Osmosis is of great importance in biological processes where the solvent is water. The transport of water and other molecules across biological membranes is essential to many processes in living organisms. The energy which drives the process is usually discussed in terms of osmotic pressure.



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