Which one of the following ion acts as chelating agent in HAP?*1 pointHydroxyl ionsPhosphate IonsCationsAll
Question
Solution
The chelating agent in Hydroxyapatite (HAP) is Phosphate Ions. Here's why:
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Hydroxyapatite is a naturally occurring mineral form of calcium apatite, its formula is Ca5(PO4)3(OH).
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In this compound, the Phosphate Ions (PO4)3- have the ability to form multiple bonds with a single metal ion, making them a chelating agent.
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Chelating agents are molecules that have multiple sites that can attach to a metal ion to form a ring-like structure. In the case of HAP, the Phosphate Ions can do this.
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Hydroxyl ions and cations do not have this ability, and therefore do not act as chelating agents in HAP.
So, the answer is Phosphate Ions.
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