Consider an aqueous solution which is 0.020 M in Pb²⁺ and 0.20 M in Ag⁺.If concentrated aqueous potassium iodide solution (so that volume changes may be neglected) is added gradually with good stirring to this solution,which precipitate will form first?
K_sp for PbI₂ = 7.1 × 10^-9;for AgI = 8.31 × 10^-17

Question

Quizplus · Accepted Answer

To determine which precipitate will form first, we need to compare the solubility product (Ksp) values for PbI2 and AgI. The precipitate with the lower Ksp value will form first.

Ksp (PbI2) = 7.1 × 10⁻⁹ 
Ksp (AgI) = 8.31 × 10⁻¹⁷

AgI has a much lower Ksp value, which means it is less soluble and will form a precipitate first. Therefore, the answer is choice C, AgI.

Consider an Aqueous Solution Which Is 0