Question

25 mL of silver nitrate solution (1M) is added dropwise to 25 mL of potassium iodide (1.05 M) solution. The ions(s) present in very small quantity in the solution is/are:

• A. NO₃⁻ only
• B. Ag⁺ and I⁻ both
• C. Ag⁺ only
• D. I⁻ only

Hint:

When mixing solutions of ionic compounds, check the solubility products (Ksp) to predict whether the ions will precipitate or remain in solution.

Answer 1

The Correct Option is C

On adding \( AgNO_3 \) to KI, \( AgI \) will form, and the solubility of \( AgI \) is very low. As a result, only \( Ag⁺ \) will remain in very small quantities in the solution. The majority of the \( I⁻ \) ions will precipitate out as \( AgI \), leaving very few ions in solution.
Thus, the correct answer is \( Ag⁺ \) ions only.