Multiple Choice
Which of the following best describes the difference between solubility and concentration?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following substances is highly soluble in water?
A
PbSO4
B
NaCl
C
CaCO3
D
AgCl
Verified step by step guidance1
Understand that solubility in water depends on the nature of the compound, particularly whether it is ionic and how strongly the ions interact with water molecules.
Recall that NaCl is an ionic compound composed of Na⁺ and Cl⁻ ions, which are highly soluble in water because water molecules stabilize these ions through hydration.
Recognize that PbSO₄, CaCO₃, and AgCl are all ionic compounds but are known to have low solubility in water due to the formation of strong ionic lattices and low lattice energy overcoming hydration energy.
Use solubility rules: most alkali metal salts (like NaCl) are soluble, while many sulfates, carbonates, and silver salts tend to be insoluble or sparingly soluble.
Conclude that among the given options, NaCl is highly soluble in water because it dissociates completely into ions that are well stabilized by water molecules.
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