Chemistry Practice Problems Electrolytes Practice Problems Solution: Classify these compounds as soluble or insoluble.a...

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Solution: Classify these compounds as soluble or insoluble.a. barium sulfate                                                                   f. sodium hydroxideb. magnesium sulfate                                                           g. magnesium hydroxidec. ammonium hydroxide                                                       h. copper (II) hydroxided. copper (II) sulfate                                                              i. barium hydroxidee. ammonium sulfate                                                            j. sodium sulfate

Problem

Classify these compounds as soluble or insoluble.

a. barium sulfate                                                                   f. sodium hydroxide

b. magnesium sulfate                                                           g. magnesium hydroxide

c. ammonium hydroxide                                                       h. copper (II) hydroxide

d. copper (II) sulfate                                                              i. barium hydroxide

e. ammonium sulfate                                                            j. sodium sulfate


Solution

We’re being asked to classify each compound as soluble or insoluble.


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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