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Chemistry LibreTexts

In-class Problem Set #5

Problem A

After completing this problem, the student will be able to:

  1. Write the reaction for the dissolution of a slight soluble metal salt.
  2. Write the appropriate Ksp expression
  3. Write two expressions for the solubility of the complex; one in terms of the concentration of metal cation, the other in terms of the concentration of anion.
  4. Substitute the two solubility expressions into Ksp and solve for the solubility of the metal salt.

Problem B

After completing this problem, the student will be able to

  1. Write two expressions for the solubility of the complex; one in terms of the concentration of metal cation, the other in terms of the concentration of anion and all protonated forms of the anion.
  2. Recognize that if the pH is known, the concentration of anion in the Ksp expression can be written as its fraction times the total concentration. 
  3. Substitute the new expression for the concentration of anion into the Ksp expression and solve for the solubility of the metal salt.

Problem C

After completing this problem, the student will be able to

  1. Write two expressions for the solubility of the complex; one in terms of the concentration of metal cation and all of its water-soluble complexes, the other in terms of the concentration of anion and all protonated forms of the anion.
  2. Recognize that if the pH is known and the concentration of ligand is known, the concentration of anion and cation in the Ksp expression can be written as their fractions times the total concentration. 
  3. Substitute the new expressions for the concentration of anion and metal cation into the Ksp expression and solve for the solubility of the metal salt.

Problem D

After completing this problem, the student will be able to

  1. Recognize that if the pH of a solution is unknown, and if solubilization of a metal salt will alter the pH, that a series of simultaneous equations are needed to solve for the solubility of the metal salt.
  2. Write the series of simultaneous equations that are necessary to solve for the solubility
  3. Write the expression for the charge balance of a solution.
  4. Write the expressions for all mass balances of a solution.

After completing the homework set on precipitation, the student will be able to:

  1. Predict whether a precipitate will form in a solution of two ions.
  2. Determine whether one ion can be quantitatively precipitated in the presence of another.