The concentration of iodide ions in a saturated solution of silver iodide is __________ M. The solubility product constant of AgI is 8.3 × 10^-17. A)3.8 × 10^-11 B)3.0 × 10^-10 C)9.1 × 10^-9 D)3.5 × 10^-9 E)1.4 × 10^-8

Question

Quizplus · Accepted Answer

The solubility product expression for AgI is:

Ksp = [Ag⁺][I⁻]

Since AgI is a sparingly soluble salt, we can assume that the concentration of Ag⁺ is negligible compared to the concentration of I⁻. Therefore, the concentration of I⁻ in a saturated solution of AgI is approximately equal to the value of the solubility product constant.

I⁻ = √(Ksp) = √(8.3 × 10⁻¹⁷) = 9.1 × 10⁻⁹ M

So, the correct answer is C.

The Concentration of Iodide Ions in a Saturated Solution of Silver