Final answer:
Without the specific aqueous solubility limit value for Succimer (C₄H₆O₄S₂), it is not possible to determine the number of units contained in the chelating treatment. Succimer is an effective chelator for treating heavy-metal intoxication.
Step-by-step explanation:
The student question regarding Succimer (C₄H₆O₄S₂) used for heavy-metal poisoning chelation treatment did not provide a specific aqueous solubility limit value, which is essential to determine how many units are contained. Consequently, it is not possible to answer options A) 1.5 units, B) 2 units, C) 2.5 units, or D) 3 units without additional information. Succimer, also known as dimercaptosuccinic acid (DMSA), is a chelating agent used to treat heavy-metal intoxication, including mercury and lead. It is effective because it can cross the blood-brain barrier and cell membranes, unlike some other chelators.
For the solubility calculations referenced in the given examples, they generally involve understanding the molarity (M), volume of the solution, and the stoichiometry of the dissolution process. However, these examples are separate from the question about Succimer and cannot be used to infer the aqueous solubility of Succimer without the actual solubility data for Succimer itself.