Multiple Choice
Which of the following chemical equations represents a precipitation reaction?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following pairs of solvents are immiscible?
A
Acetone and water
B
Methanol and ethanol
C
Ethanol and water
D
Water and hexane
Verified step by step guidance1
Understand the concept of miscibility: Two solvents are miscible if they can mix in all proportions without separating into two phases. Immiscible solvents do not mix well and form separate layers.
Recall the polarity of the solvents: Water is highly polar, acetone is polar aprotic, methanol and ethanol are polar protic solvents, and hexane is nonpolar.
Apply the 'like dissolves like' principle: Polar solvents tend to be miscible with other polar solvents, and nonpolar solvents tend to be miscible with other nonpolar solvents.
Analyze each pair: Acetone and water are both polar, so they are miscible; methanol and ethanol are both polar protic and similar in structure, so they are miscible; ethanol and water are both polar and hydrogen bond, so they are miscible.
Recognize that water (polar) and hexane (nonpolar) have very different polarities, making them immiscible and thus the correct answer.
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