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NEET2009ChemistryChemical EquilibriumActual

In III group precipitation, NH ₄ Cl is added before adding NH ₄ OH to

Options

  1. Adecrease conc. of OH ⁻
  2. Bprevent interference of PO ₄³⁻
  3. Cincrease conc. of Cl ⁻
  4. Dincrease conc. of OH ⁻ ion

Correct answer

A. decrease conc. of OH ⁻

Step-by-step solution

In III group precipitation, NH ₄ Cl is added before adding NH ₄ OH to decrease the conc. of OH ⁻ , as NH ₄ Cl and NH ₄ OH dissociates as follows. aligned & NH ₄ Cl NH ₄⁺+ Cl ⁻ & NH ₄ OH common ion NH ₄⁺+ OH ⁻ aligned Due to presence of common ion, conc. of OH ⁻ decreases and for III group precipitation lesser conc. of OH ⁻ is required.

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