When a solute species dissolves and precipitates at the same rates, solubility equilibria are established.
These equilibria govern a variety of technical and natural processes, from water filtration to tooth decay. To control these processes effectively, one must have a thorough understanding of the variables impacting chemical solubility. The methods and concepts of equilibrium that were previously covered in this section are applied to systems involving dissolution and precipitation.
A substance can be essentially insoluble or sparingly soluble, or it can be infinitely soluble (miscible). When added to a solvent in a quantity greater than its solubility, a solute with finite solubility can produce a saturated solution, creating a heterogeneous combination of the saturated solution and the excess, undissolved solute. For instance, the equilibrium depicted below has been reached in a saturated solution of silver chloride.
AgCl(s) ⇌ precipitation dissolution
Ag⁺(aq) + Cl⁻(aq)
At the same pace as these aqueous ions mix and precipitate to form solid AgCl, an excess of solid AgCl dissolves and dissociates in this solution to create aqueous Ag⁺ and Cl⁻ ions . The equilibrium concentration of silver chloride's dissolved ions in the solution is relatively low because silver chloride is a salt that is only sporadically soluble.
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