Fluorite Solubility and Ksp Concepts

The video tutorial explains the solubility product constant using fluorite (CaF2) as an example. It covers the dissolution equation, measuring calcium ion concentration, and calculating fluoride ion concentration using stoichiometry. The tutorial then guides viewers through writing the Ksp expression and calculating the Ksp value for fluorite.

What is the chemical formula for fluorite?

• CaCl2

• CaCO3

• CaF2

• CaO

In a saturated solution of fluorite, if the calcium ion concentration is 2.1 x 10^-4 M, what is the fluoride ion concentration?

• 2.1 x 10^-4 M

• 8.4 x 10^-4 M

• 4.2 x 10^-4 M

• 1.05 x 10^-4 M

How many fluoride ions are produced for each calcium ion when fluorite dissolves?

• Four

• Two

• One

• Three

What is the expression for the solubility product constant (Ksp) of fluorite?

• [Ca2+]^2[F-]^2

• [Ca2+]^2[F-]

• [Ca2+][F-]^2

• [Ca2+][F-]

Why is the reactant not included in the Ksp expression for fluorite?

• Because it is an aqueous solution

• Because it is a solid

• Because it is a liquid

• Because it is a gas

Which of the following best describes the stoichiometry used to determine the fluoride ion concentration?

• It is based on the ratio of fluoride ions to water molecules.

• It is based on the ratio of fluoride ions to calcium carbonate.

• It is based on the ratio of calcium ions to fluoride ions.

• It is based on the ratio of calcium ions to water molecules.

What is the calculated Ksp value for fluorite given the concentrations?

• 4.2 x 10^-11

• 3.7 x 10^-11

• 1.5 x 10^-11

• 2.1 x 10^-11

What is the significance of the solubility product constant (Ksp) in this context?

• It predicts the temperature at which the compound dissolves.

• It measures the solubility of a compound in water.

• It determines the color of the solution.

• It indicates the rate of reaction.