Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEETChemistryIonic Equilibrium

Calculate the solubility of PbSO ₄ in a 0.05 M solution of Al ₂( SO ₄)₃ . (Given: K_ sp of PbSO ₄ = 1.5 10⁻⁸ )

Options

  1. A3.0 10⁻⁷ M
  2. B1.0 10⁻⁷ M
  3. C1.5 10⁻⁷ M
  4. D6.67 10⁻⁷ M

Correct answer

B. 1.0 10⁻⁷ M

Step-by-step solution

The strong electrolyte Al ₂( SO ₄)₃ dissociates completely in solution: Al ₂( SO ₄)₃ 2 Al ³⁺ + 3 SO ₄²⁻ The concentration of the common ion, [ SO ₄²⁻] = 3 0.05 M = 0.15 M . For the sparingly soluble salt PbSO ₄ : PbSO ₄(s) Pb ²⁺(aq) + SO ₄²⁻(aq) Let the solubility of PbSO ₄ in this solution be s . The solubility product expression is: K_ sp = [ Pb ²⁺][ SO ₄²⁻] Substituting the values (neglecting the small amount of SO ₄²⁻ from PbSO ₄ ): 1.5 10⁻⁸ = s (0.15) s = 1.5 10⁻⁸ 0.15 = 1.0 10⁻⁷ M Answer: 1.0 10⁻⁷ M

Practice Ionic Equilibrium on Quantrex Academy →

More from Ionic Equilibrium

What amount of NaOH should be dissolved in a 500 mL solution, so that the p ^ H of solution is 12 at 298 K ? 2026Which of the following buffer solutions is used for precipitation of cations of the III A group? 2026The degree of dissociation of weak acid is directly proportional to 2026Which from the following is Lewis base? 2026The solubility of Fe(OH) ₃ is x mole per liter. Find its K_ sp . 2026The Basic buffer solution is made with 0.1 M NH ₄ OH and 0.2 M NH ₄ Cl . If K_b for the base is 1.8 10⁻⁵ , what is the pH of the buffer? 2026The hydrogen ion concentration of the ocean is about 2 10⁻⁹ M . What is the pOH of ocean? 2026Calculate the dissociation constant of a weak monobasic acid if it is 0.04% dissociated in a 0.01M solution. 2026 Full Ionic Equilibrium list All NEET PYQs