Problem: A saturated solution of Cd(OH)2 is shown in the middle beaker. If hydrochloric acid solution is added, the solubility of Cd(OH)2 will increase, causing additional solid to dissolve.Which of the two choices, Beaker A or Beaker B, accurately represents the solution after equilibrium is reestablished? (The water molecules and Cl- ions are omitted for clarity.)

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We are asked which of the two choices, Beaker A or Beaker B, accurately represents the solution after equilibrium is reestablished. (The water molecules and Cl- ions are omitted for clarity.)


The dissolution of Cd(OH)in water can be represented by:

Cd(OH)2 (s) ⇌  Cd2+ (aq)+ OH-(aq)

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Problem Details

A saturated solution of Cd(OH)2 is shown in the middle beaker. If hydrochloric acid solution is added, the solubility of Cd(OH)will increase, causing additional solid to dissolve.

A beaker contains a saturated solution with Cd2+ and OH- ions and Cd(OH)2 solid. Beaker A: Adding HCl leads to more Cd2+ and less precipitate. Beaker B: Adding HCl leads to more OH- and less precipitate.


Which of the two choices, Beaker A or Beaker B, accurately represents the solution after equilibrium is reestablished? (The water molecules and Cl- ions are omitted for clarity.)

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Equivalence Point concept. If you need more Equivalence Point practice, you can also practice Equivalence Point practice problems.

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Based on our data, we think this problem is relevant for Professor Cabirac's class at ASU.