Determine the solubility of BaSO4 in water if Ksp=1.1...

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Key Concepts

Solubility Product Constant (Ksp)

The solubility product constant is an equilibrium constant that applies to the dissolution of a sparingly soluble ionic compound. It is expressed as the product of the molar concentrations of the resulting ions, each raised to the power of their respective coefficients in the balanced dissolution equation. The low Ksp value signifies that the compound dissolves very little in water.

Dissolution Equilibrium

Dissolution equilibrium refers to the process where a sparingly soluble solid dissolves in water to form its constituent ions until a dynamic balance is reached between the solid and the solvated ions. For example, in the dissolution of a salt that dissociates into two ions, at equilibrium, the rate at which the salt dissolves equals the rate at which the ions recombine.

Stoichiometric Relationships in Dissolution Reactions

In dissolution reactions, the stoichiometry indicates the molar ratio in which the compound dissociates into its ions. When a salt like one that dissociates into one cation and one anion dissolves, the solubility in water (denoted as s) directly relates to the ionic concentrations. This relationship allows for setting up the equilibrium expression through the molar solubility and consequently solving for it using the Ksp.

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