Question

A solution contains 1.0 × 10^–2 mol of KI and 0.10 mol of KCl per liter. AgNO3 is gradually added to this solution. Which forms first, solid AgI or solid AgCl?

a) Solid AgI

b) Solid AgCl

c) Both form simultaneously

d) It cannot be determined

Answer 1

Solid AgI will precipitate first from the solution when AgNO3 is added, due to its smaller Ksp value compared to AgCl. The correct option is b) Solid AgCl.

Step-by-step explanation:

The question is asking which solid, AgI or AgCl, will precipitate first when AgNO3 is added to a solution containing KI and KCl. The answer to this question can be determined by comparing the solubility products (Ksp) of AgI and AgCl.

The silver halide with the smaller Ksp will precipitate first, as it is less soluble in the solution. The Ksp value for AgI is smaller than that of AgCl, therefore, silver iodide (AgI) will precipitate before silver chloride (AgCl).