Chemistry Practice Problems Electrolytes Practice Problems Solution: What of the following should be insoluble in water...

Solution: What of the following should be insoluble in water?A. NaNO3B. ZnBr2C. Cd(ClO3)2D. Ag2SO4E. Ba(OH)2

Problem

What of the following should be insoluble in water?

A. NaNO3

B. ZnBr2

C. Cd(ClO3)2

D. Ag2SO4

E. Ba(OH)2

Solution

Use the solubility rules in order to determine the insoluble compound among the choices.


Recall that 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

• Halides (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:

• Hydroxides (OH) and Sulfides (S2–) are insoluble except when with Group 1A ions (Li+, Na+, K+, etc.), ammonium ion (NH4+), Ca2+, Sr2+, and Ba2+

• Carbonates (CO32–) and Phosphates (PO43–) are insoluble except when with Group 1A ions (Li+, Na+, K+, etc.) and ammonium ion (NH4+)


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