Friday, January 24, 2014

Identify a few factors that increase the solubility of solids in a solvent and why do they affect the dissolving rate?

There are many factors that affect the solubility of
solids in a solvent. Some of them
are:


  • Temperature:

Solubility
varies with the inter-molecular forces between the particles of the solute and the
solvent. A change in temperature changes these forces. This makes solubility of solids
in a liquid dependent on the temperature. It is usually found that increasing
temperatures increase solubility and vice
versa.


  • Structure of the
    solute:

Compounds with the same chemical
composition can have different phases. These determine the shape of crystals of the
compound and the intermolecular attraction. The solubility for two allotropes with the
same chemical composition can vary to a large extent. Solubility is also dependent on
the size of the particles being dissolved and the amount of disorder in the particles.
An increased disorder increases
solubility


  • Presence of other compounds in the
    the solvent:

The presence of other chemical
compounds affects the solubility of solids. This can be due the fact that the
intermolecular space between the solvent molecules is occupied by the other compound and
also due to chemical interactions between the impurities and the solid that is being
dissolved.

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