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Solution: 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.)

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.)

Solution

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)₂ in water can be represented by:

Cd(OH)_{2 (s)} ⇌  Cd²⁺ _(aq)+ OH^-_(aq)

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