Chemistry Practice Problems Electrolytes Practice Problems Solution: Which one of the following compounds is soluble in...

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Solution: Which one of the following compounds is soluble in water?a. Cu3(PO4)2b. Co(NO3)2c. CdSd. CaCO3

Problem

Which one of the following compounds is soluble in water?

a. Cu3(PO4)2

b. Co(NO3)2

c. CdS

d. CaCO3

Solution

We’re being asked to determine the soluble compound among the choices.


For this problem, we need the 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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