What characteristic describes the solubility curve of metal hydroxides that exhibit amphoterism when solubility is plotted against $ ext{pH}$?
Answer
Solubility increases in both highly acidic and highly basic solutions, forming a U-shaped curve.
Amphoteric substances react with both acid (by consuming $ ext{OH}^-$) and base (by forming a complex ion with excess $ ext{OH}^-$). This results in minimum solubility occurring at an intermediate $ ext{pH}$.
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