Solubility Equilibrium Concepts

This video tutorial explains the concept of solubility equilibrium, focusing on the equilibrium established when ionic compounds or salts dissolve in water. It introduces the equilibrium constant Ksp, which is specific to solubility equilibria, and contrasts it with the general equilibrium constant Keq. The video provides an example using potassium carbonate to illustrate the process of dissolving and precipitating in solution. It also clarifies the difference between physical and chemical equilibrium, emphasizing that no new compounds are formed. Finally, it guides viewers on writing equilibrium expressions for solubility equilibria, highlighting the importance of ignoring solids and pure liquids in these expressions.

What type of equilibrium is discussed when ionic compounds dissolve in water?

• Chemical equilibrium

• Mechanical equilibrium

• Solubility equilibrium

• Thermal equilibrium

What does the 'sp' in Ksp stand for?

• Specific product

• Solubility product

• Solid product

• Solution product

In the context of solubility equilibrium, what is the forward reaction?

• Precipitation of ions

• Evaporation of water

• Dissolving of solid into ions

• Formation of a new compound

What is the reverse reaction in the solubility equilibrium of potassium carbonate?

• Dissolving of solid

• Precipitation of ions

• Melting of solid

• Formation of gas

What happens to the ions in the reverse reaction of a solubility equilibrium?

• They remain unchanged

• They dissolve further

• They precipitate as a solid

• They form a gas

How is a physical equilibrium different from a chemical reaction?

• It involves the creation of new compounds

• It involves only a change in state, not composition

• It requires a catalyst

• It is irreversible

In a solubility equilibrium, why are solids not included in the equilibrium expression?

• They are always in excess

• They have a constant concentration

• They are not part of the reaction

• They react too quickly

What is the role of stoichiometric coefficients in the equilibrium expression?

• They are ignored

• They are used as exponents

• They determine the reaction rate

• They are added to the concentration

What is the equilibrium expression for a solubility equilibrium?

• Difference between reactants and products

• Sum of reactants and products

• Products over reactants

• Reactants over products

Why is Ksp used instead of Keq for solubility equilibria?

• Ksp is specific to solubility

• Ksp is more accurate

• Ksp is easier to calculate

• Keq cannot be used for solids