Chapter 3 Chemical Reactions - Study Questions - Page 137b: 16

a) $Ni^{2+}, 2\ Cl^-$ b) $Cr^{3+}, 3\ NO_3^-$ c) $Pb^{2+}, 2\ NO_3^-$ d) Insoluble

a) $Ni^{2+}, 2\ Cl^-$ Chlorides are usually soluble; nickel (||)'s is not an exception. b) $Cr^{3+}, 3\ NO_3^-$ Nitrates are almost always soluble. c) $Pb^{2+}, 2\ NO_3^-$ Nitrates are almost always soluble. d) Insoluble Sulfates are usually soluble, but barium's is an exception.