MDCAT Chemistry MCQ #2264

In Group III qualitative analysis, NH4Cl is added before NH4OH. What is the role of NH4Cl in this specific procedure?

MDCAT Chemistry MCQ #2264

  1. Question 1

    Q1. In Group III qualitative analysis, NH4Cl is added before NH4OH. What is the role of NH4Cl in this specific procedure?

    • A) To increase the concentration of OH- ions
    • B) To make the solution more acidic
    • C) To decrease the concentration of OH- ions
    • D) To react with Group III metal ions directly

    Answer: To decrease the concentration of OH- ions

    Explanation: NH4Cl provides a common ion (NH4+) that reduces NH4OH ionization, preventing Group IV precipitation. Option D is wrong.