We are asked to identify the pairs of aqueous solutions that will form a precipitate when mixed. We will refer to the solubility rules in order to determine if an insoluble product 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 of the following pairs of aqueous solutions will form a precipitate when mixed?
A. Sr(C2H3O2)2 + Na2SO4
B. (NH4)2SO4 + KCl
C. KNO3 + LiOH
D. KOH + Li2S
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