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Paragraph: Pb ( IO ₃ )₂ is a sparingly soluble salt ( K _ sp =2.7 10⁻¹³ ) . To 35 ml 0.15 M Pb ( NO ₃ )₂ solution, 15 ml of 0.8 M KIO ₃ solution is added and a precipitate of Pb ( IO ₃ )₂ is formed. Question: What will the molarity of Pb ⁺² ions in the solution after completion of the reaction

Options

  1. A8.4 10⁻¹⁰
  2. B1.6 10⁻¹⁰
  3. C3.0 10⁻¹⁰
  4. D6.1 10⁻¹⁰

Correct answer

C. 3.0 10⁻¹⁰

Step-by-step solution

Due to common ion ( IO ₃⁻ ) left in the solution the solubility Pb ( IO ₃ )₂ decreases. aligned & S = K _ sp (0.03)^2 = 2.7 10⁻¹³ 10^4 9 & =0.30 10⁻⁹ & =3.0 10⁻¹⁰ aligned

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