We are asked to determine whether precipitation will occur when FeSO₄ and Pb(NO₃)₂ are mixed. 

Recall that precipitation is a type of double displacement reaction that forms an insoluble (s) product or a precipitate.

We will refer to the solubility rules in order to determine if an insoluble product is formed or not.

Solubility Rules:

•Soluble Ionic Compounds:

▪Group 1A ions (Li⁺, Na⁺, K⁺, etc.) and Ammoniumion (NH₄⁺) are soluble
▪Nitrates (NO₃^-), Acetates (CH₃COO^- or C₂H₃O₂^-), and most Perchlorates (ClO₄^-) are soluble
▪Cl^-, Br^-, and I^- are soluble except when paired with Ag⁺, Pb²⁺, Cu⁺, Hg₂²⁺
▪Sulfates (SO₄^2-) are soluble except those of Ca²⁺, Sr²⁺, Ba²⁺, Ag⁺, and Pb²⁺

• Insoluble Ionic Compounds: