Why does a clear, saturated solution of PbI2 form a yellow precipitate when a small amount of KI is added to the solution?

A. KI is insoluble in PbI2.
B. PbI2 is always insoluble in water.
C. Adding KI is like adding I-, which drives the reaction toward the formation of PbI2.
D. Adding KI is like adding I-, which drives the reaction toward the formation of I-.

Question

Why does a clear, saturated solution of PbI2 form a yellow precipitate when a small amount of KI is added to the solution?

 		A.	KI is insoluble in PbI2.
 		B.	PbI2 is always insoluble in water.
 		C.	Adding KI is like adding I-, which drives the reaction toward the formation of PbI2.
 		D.	Adding KI is like adding I-, which drives the reaction toward the formation of I-.

vera_ewing · Answer

@thomaster Check my answer please!

vera_ewing · Answer

@Somy C or D?

anonymous · Answer

C

vera_ewing · Answer

@missylulu Can you please explain how you got that?

anonymous · Answer

C

anonymous · Answer

I- won't produce a yellow precipitate, PbI2 does