We are asked to identify the precipitate formed when two salts are mixed together. We will refer to the solubility rules in order to determine if an insoluble product (precipitate) is formed or not.
•Soluble Ionic Compounds:
▪ Group 1A ions (Li+, Na+, K+, etc.) and Ammonium ion (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 (SO42-) are soluble except those of Ca2+, Sr2+, Ba2+, Ag+, and Pb2+
• Insoluble Ionic Compounds:
Which combination will produce a precipitate?
A. Cu(NO3)2(aq) and KC2H3O2(aq)
B. AgC2H3O2(aq) and HC2H3O2(aq)
C. KOH (aq) and HNO3(aq)
D. Pb(NO3)2(aq) and HCl(aq)
E. NaOH(aq) and Sr(NO3)2(aq)
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