Multiple Choice
Which of the following is a polar aprotic solvent?
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8. Elimination Reactions
Solvents
Problem 56
Textbook Question
If a small amount of a moderately nonpolar poisonous compound was added to a pond, why would it be safer to drink the water than it would be to eat the fish that live there?
Verified step by step guidance1
Understand the concept of bioaccumulation: Bioaccumulation refers to the process by which organisms accumulate toxic substances, such as nonpolar compounds, at a rate faster than they can eliminate them.
Consider the solubility of nonpolar compounds: Nonpolar compounds tend to be more soluble in organic solvents and lipids than in water. This means they are more likely to accumulate in the fatty tissues of organisms, such as fish, rather than remaining dissolved in the water.
Analyze the food chain dynamics: Fish, being higher up in the food chain, can accumulate higher concentrations of the nonpolar compound through their diet, as they consume smaller organisms that have absorbed the compound.
Evaluate the concentration effect: The concentration of the nonpolar compound in the fish is likely to be higher than in the water due to bioaccumulation, making the fish more hazardous to consume.
Conclude with risk assessment: Drinking the water, which contains a lower concentration of the compound, poses less risk than eating the fish, which have accumulated higher levels of the toxin in their tissues.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Polarity and Solubility
Polarity refers to the distribution of electrical charge over the atoms in a molecule. Nonpolar compounds tend to be hydrophobic, meaning they do not dissolve well in water. This concept is crucial because it explains why the nonpolar compound might not mix thoroughly with the pond water, making the water safer to drink than consuming fish that may accumulate the compound.
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Bioaccumulation
Bioaccumulation is the process by which organisms accumulate substances, such as pesticides or other chemicals, in their bodies over time. Fish can absorb nonpolar compounds from the water and store them in their fatty tissues, leading to higher concentrations than in the surrounding water. Understanding this concept helps explain why eating fish could be more dangerous than drinking the water.
Food Chain and Biomagnification
Biomagnification refers to the increase in concentration of a substance in a food chain. As small fish consume contaminated water and are eaten by larger fish, the concentration of the nonpolar compound increases at each trophic level. This concept is essential for understanding why the compound's concentration might be higher in fish than in the water, posing a greater risk when consuming fish.
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