Multiple Choice
Which of the following usually makes a substance dissolve faster in a solvent?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following compounds is most soluble in water?
A
PbSO4
B
AgCl
C
NaCl
D
CaCO3
Verified step by step guidance1
Step 1: Understand that solubility in water depends largely on the compound's ability to dissociate into ions and the lattice energy of the solid. Ionic compounds with ions that interact strongly with water molecules tend to be more soluble.
Step 2: Recognize that NaCl is a salt composed of Na⁺ and Cl⁻ ions, both of which are highly soluble in water due to strong ion-dipole interactions with water molecules.
Step 3: Compare the other compounds: PbSO₄, AgCl, and CaCO₃ are all sparingly soluble salts because they have higher lattice energies and form less soluble ions in water.
Step 4: Recall that solubility rules indicate that most sodium salts (like NaCl) are soluble, while sulfates of lead (PbSO₄), chlorides of silver (AgCl), and carbonates of calcium (CaCO₃) are generally insoluble or only slightly soluble in water.
Step 5: Conclude that among the given options, NaCl is the most soluble in water due to its ionic nature and the strong hydration of its ions.
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