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Chemistry LibreTexts

Assessment Question Set #1 – Solubility Equilibria

  • Page ID
    199657
  • Q1. Write the balanced reaction for the dissolution of iron (III) hydroxide in water.

    Q2. Write the equilibrium constant expression for the solubility of iron (III) hydroxide.

    Q3. Calculate the molar solubility of iron (III) hydroxide in pure water.

    Q4. Calculate the molar solubility of iron (III) hydroxide at pH 6.4, and compare it to the calculated molar solubility of iron (III) hydroxide in Q3.

    Q5. Calculate the molar solubility of iron (III) hydroxide when the ionic strength of the pH 6.4 buffer is 0.10 mol L-1.

    Q6. To prevent precipitation of iron (III) hydroxide in household water systems, hydrogen peroxide is often added as an oxidizing agent to municipal water sources containing iron (II) ion concentrations above 0.3 mg L‑1. Compare the effectiveness of this treatment at pH 6.4 versus pH 2.0 at a dissolved iron (i.e. Fe2+) concentration of 0.3 mg L-1.