Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: When a colorless solution of lead(II) nitrate is added to a colorless solution of potassium iodide, a yellow solid called a precipitate is instantly produced ( Figure below ). A precipitate is a solid product that forms from a reaction and settles out of a liquid mixture. The formation of a precipitate may also indicate the occurrence of a chemical reaction. Answer: yellow solid precipitate
A:
What is produced when a colorless solution of lead nitrate is added to a colorless solution of potassium iodide?