Arsenic Poisoning Is a Serious Problem in Many Parts of the World

question 43

Multiple Choice

Arsenic poisoning is a serious problem in many parts of the world. When arsenic poisoning occurs, arsenic binds to proteins and eventually causes cellular damage. This leads to a variety of symptoms in humans including exhaustion, muscle weakness, organ failure, and cancer. Arsenic poisoning is commonly treated with a drug called dimercaprol (or BAL) that binds arsenic, which sets up a competing equilibrium within the body. Once arsenic reacts to form a complex with BAL, it can be excreted from the body. Arsenic-protein complex Arsenic + proteins + BAL Arsenic-BAL complex
How does treatment with BAL affect the equilibrium shown above?

• A) Adding BAL does not affect the equilibrium.
• B) Adding BAL pushes the reaction to the left.
• C) Adding BAL pushes the reaction to the right.
• D) Adding BAL causes less arsenic-BAL to be made.
• E) Adding BAL causes more arsenic-protein complex to be made.

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