04-02-2013, 12:17 PM
Study the Diffusion of Solids in Liquids
[attachment=49520]
Introduction
When substances are brought in contact with each
other, they intermingle with each other. This
phenomenon is known as diffusion. Diffusion takes
place very rapidly in case of gases, to a lesser extent
in case of liquids, and not at all in the case of solids.
However, diffusion of solids in liquids does take
place, albeit at a very slow rate.
If a solid is kept in contact with excess of solvent in
which it is soluble, some portion of the solid gets
dissolved. This process is known as dissolution of a
solid in liquid, and it takes place due to the diffusion
of solid particles into liquid medium.
Molecules of solute are in constant random motion
due to the collision between molecules of solute and
that of the solvent. It is this physical interaction
between solute-solvent particles that leads to
diffusion.
Objective
To demonstrate that rate of diffusion depends upon
the following factors:
Temperature: As temperature increases, the
kinetic energy of the particles increases. Thus,
the speed of particles also increases, which in
turn increases the rate of diffusion.
Size of the particle: As the size of particle
increases, rate of diffusion decreases. This is
because the particles become less mobile in the
solvent.
Mass of the particle: As the mass of the
particle increases, the rate of diffusion
decreases; as the particle becomes less mobile.
[attachment=49520]
Introduction
When substances are brought in contact with each
other, they intermingle with each other. This
phenomenon is known as diffusion. Diffusion takes
place very rapidly in case of gases, to a lesser extent
in case of liquids, and not at all in the case of solids.
However, diffusion of solids in liquids does take
place, albeit at a very slow rate.
If a solid is kept in contact with excess of solvent in
which it is soluble, some portion of the solid gets
dissolved. This process is known as dissolution of a
solid in liquid, and it takes place due to the diffusion
of solid particles into liquid medium.
Molecules of solute are in constant random motion
due to the collision between molecules of solute and
that of the solvent. It is this physical interaction
between solute-solvent particles that leads to
diffusion.
Objective
To demonstrate that rate of diffusion depends upon
the following factors:
Temperature: As temperature increases, the
kinetic energy of the particles increases. Thus,
the speed of particles also increases, which in
turn increases the rate of diffusion.
Size of the particle: As the size of particle
increases, rate of diffusion decreases. This is
because the particles become less mobile in the
solvent.
Mass of the particle: As the mass of the
particle increases, the rate of diffusion
decreases; as the particle becomes less mobile.