Problem: With which of the following with the Potassium ion form an insoluble salt?A) IodideB) SulfideC) SulfateD) PhosphateE) Potassium will form soluble salts with all choices

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We’re being asked which of the following with the Potassium ion form an insoluble salt


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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Problem Details

With which of the following with the Potassium ion form an insoluble salt?
A) Iodide
B) Sulfide
C) Sulfate
D) Phosphate
E) Potassium will form soluble salts with all choices

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