Topic-10

Changing Solubility of Solutions

Key Concepts

The Common Ion Effect And Other Ways To Alter The Solubility Of A Salt

1. The solubility of an ionic compound cannot be changed in pure water.

2. If we increase the rate of dissolving more than the rate of crystallization, then more ionic compound will leave the solid phase and become the aqueous phase. In this way, the solubility of a salt will increase. If we increase the rate of crystallization, then more ions will leave the aqueous phase and become the solid phase.

3. According to the Le Chatelier’s principle, changing the concentration of the dissolved ions in the equilibrium will cause the equilibrium to shift to the solid side or the ions side.

4. The common ion effect is to lower the solubility of a salt by adding a second salt that has a common ion with the first salt.

5. If we increase the concentration of one of the ions in solution, then the equilibrium will shift and it causes more solid to form. If we decrease the concentration of one of the ions in solution, then the equilibrium will also shift. It dissolves more of the solid and brings the concentration back up.

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