Problem: If an aqueous solution of ____ is added to a mixture of Pb 2+ and Ba2+, the lead ion will precipitate, but the barium ion will remain in solution.a. NaOHb. Na2SO4c. K3PO4d. KCO3e. Ca(CH3CO2)2 

FREE Expert Solution

Determine the reagent that forms a precipitate in Pb2+ but not with Ba2+ using the solubility rules. 

Solubility Rules:

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+

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Problem Details

If an aqueous solution of ____ is added to a mixture of Pb 2+ and Ba2+, the lead ion will precipitate, but the barium ion will remain in solution.

a. NaOH

b. Na2SO4

c. K3PO4

d. KCO3

e. Ca(CH3CO2)2