During an experiment, 300 mL of 2.0 × 10^-⁵ M AgNO₃ is going to be added to 200 mL of 2.5 × 10^-⁹ M NaI. Will a precipitate form? What is the precipitate? The K_sp forAgI is 8.3 × 10^-¹⁷.Hint: Find the concentration of each ion and use those concentrations to find Q for any insoluble compounds that might form.

Question

Quizplus · Accepted Answer

The concentrations of Ag⁺ and I^- ions are calculated after mixing. The concentration of Ag⁺ is (2.0 × 10^-5 M)(300 mL/500 mL) = 1.2 × 10^-5 M, and the concentration of I^- is (2.5 × 10^-9 M)(200 mL/500 mL) = 1.0 × 10^-9 M. The reaction quotient Q = [Ag⁺][I^-] = (1.2 × 10^-5)(1.0 × 10^-9) = 1.2 × 10^-14, which is greater than K_sp (8.3 × 10^-17), so AgI will precipitate.

During an Experiment, 300 ML of 2