Multiple Choice
Which of the following actions would increase the rate at which NaCl dissolves in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which statement best describes how temperature affects the solubility of most solid ionic compounds in water?
A
Increasing temperature generally increases the solubility of most solid ionic compounds.
B
Decreasing temperature generally increases the solubility of most solid ionic compounds.
C
Increasing temperature generally decreases the solubility of most solid ionic compounds.
D
Temperature has no effect on the solubility of solid ionic compounds.
Verified step by step guidance1
Understand that solubility refers to the maximum amount of a substance (solute) that can dissolve in a solvent at a given temperature to form a saturated solution.
Recall that for most solid ionic compounds, the dissolution process is endothermic, meaning it absorbs heat from the surroundings.
Apply Le Chatelier's Principle: if the dissolution is endothermic, increasing temperature adds heat, which shifts the equilibrium to favor more dissolution, thus increasing solubility.
Recognize that decreasing temperature removes heat, which shifts the equilibrium to favor less dissolution, decreasing solubility for most solids.
Conclude that temperature generally has a significant effect on solubility, and for most solid ionic compounds, increasing temperature increases their solubility in water.
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