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Solubility Product Constant (Ksp) quiz

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  • What does the solubility product constant (Ksp) represent?
    Ksp is the equilibrium constant that describes the solubility of ionic solids in a solvent. It indicates how much of the solid dissolves to form ions.
  • How does a higher Ksp value affect the solubility of an ionic solid?
    A higher Ksp value means the ionic solid is more soluble in the solvent. More of the solid will dissolve to form ions.
  • What does a lower Ksp value indicate about an ionic solid?
    A lower Ksp value indicates the ionic solid is less soluble. Less of the solid will dissolve in the solvent.
  • What are the two competing processes when an ionic solid is placed in a solvent?
    The two processes are the dissolution reaction (solid breaking into ions) and its reverse (ions recombining into solid). These processes reach equilibrium.
  • How do you write the equilibrium expression for Ksp?
    The equilibrium expression is the ratio of the concentrations of products over reactants, but solids and liquids are ignored. Only the concentrations of ions in solution are included.
  • Why are solids and liquids ignored in the equilibrium expression for Ksp?
    Solids and liquids are ignored because their concentrations do not change during the reaction. Only aqueous ions are considered in the expression.
  • How do you break down an ionic solid into its ions for a Ksp calculation?
    Write the solid as dissociating into its constituent ions, using the correct coefficients and charges. For example, Ag3PO4 breaks into 3 Ag+ and 1 PO4^3-.
  • What role do coefficients play in the Ksp equilibrium expression?
    Coefficients become exponents in the equilibrium expression. For example, if there are 3 Ag+ ions, the concentration of Ag+ is raised to the third power.
  • How do you calculate Ksp if the solubility of an ionic solid is known?
    Substitute the solubility value into the equilibrium expression, using coefficients to determine the powers, and solve for Ksp. The solubility is used as the variable x.
  • What is the Ksp value for silver phosphate (Ag3PO4) with a solubility of 1.8 x 10^-18?
    The Ksp for Ag3PO4 is calculated as 2.8 x 10^-70. This is found by substituting the solubility into the equilibrium expression and solving.
  • How do you use Ksp to determine the solubility of an ionic solid?
    Set up the equilibrium expression with Ksp and solve for the solubility variable x. This involves algebraic manipulation and taking roots if necessary.
  • What is the equilibrium equation for strontium fluoride (SrF2)?
    SrF2(s) dissociates into Sr^2+(aq) and 2 F^-(aq). This shows the breakdown of the solid into its ions.
  • How is the equilibrium expression for SrF2 written?
    Ksp = [Sr^2+][F^-]^2. The coefficient of 2 for F^- becomes the exponent in the expression.
  • What is the calculated solubility of SrF2 if its Ksp is 7.9 x 10^-10?
    The solubility of SrF2 is 5.8 x 10^-4 M. This is found by solving the equilibrium expression for x.
  • Why is it important to use significant figures when reporting Ksp or solubility values?
    Significant figures reflect the precision of the measured or given values. The answer should match the number of significant figures in the original data.