Multiple Choice
Which of the following best describes what it means when a substance is water-soluble?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following compounds is insoluble in water?
A
NH4Br
B
NaNO3
C
K2SO4
D
AgCl
Verified step by step guidance1
Understand the concept of solubility: Solubility in water depends on the nature of the compound and the interactions between the ions and water molecules. Ionic compounds with ions that strongly interact with water tend to be soluble.
Recall common solubility rules: Most ammonium (NH4+) salts, nitrates (NO3-), and alkali metal salts (like Na+ and K+) are soluble in water. This means NH4Br, NaNO3, and K2SO4 are generally soluble.
Identify exceptions to solubility rules: Silver chloride (AgCl) is a well-known exception because silver halides (AgX, where X = Cl, Br, I) are typically insoluble or sparingly soluble in water.
Compare the given compounds: NH4Br, NaNO3, and K2SO4 all contain ions that form soluble salts, while AgCl is known to be insoluble in water due to the low solubility of silver chloride.
Conclude that among the listed compounds, AgCl is insoluble in water, while the others are soluble based on standard solubility rules.
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