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MHT CET Medical202625 April 2026Evening ShiftChemistryIonic EquilibriumActual

The solubility of Fe(OH) ₃ is x mole per liter. Find its K_ sp .

Options

  1. A9x^3
  2. B3x^4
  3. C27x^4
  4. D9x^4

Correct answer

C. 27x^4

Step-by-step solution

The dissociation reaction of Fe(OH) ₃ is given by: Fe(OH) ₃ Fe ³⁺ + 3 OH ^- Given the solubility of Fe(OH) ₃ is x mol/L, the equilibrium concentrations of the ions are: [ Fe ³⁺] = x [ OH ^-] = 3x The solubility product constant K_ sp is written as: K_ sp = [ Fe ³⁺][ OH ^-]^3 Substituting the concentrations into the expression: K_ sp = (x)(3x)^3 K_ sp = 27x^4 Answer: 27x^4

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