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Manipal MET2020ChemistryIonic Equilibrium

In qualitative analysis, NH ₄ Cl is added before NH ₄ OH

Options

  1. Ato increase [ OH ⁻ ] concentration
  2. Bfor making HCl
  3. Cto decrease [ OH ⁻ ] concentration
  4. Dstatement is wrong

Correct answer

C. to decrease [ OH ⁻ ] concentration

Step-by-step solution

In qualitative analysis, NH ₄ Cl is added before NH ₄ OH to , decrease [ OH ⁻ ] concentration. NH ₄ Cl suppresses the ionisation of NH ₄ OH due to common ion effect. Otherwise basic radicals of group V and group VI will be precipitated along with Illrd group basic radicals.

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