Amphoteric Hydroxides Overview

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Questions and Answers

Which of the following metal ions form amphoteric hydroxides? (Select all that apply)

  • Na+
  • Zn2+ (correct)
  • Pb2+ (correct)
  • Al3+ (correct)

Amphoteric hydroxides are soluble only in acidic solutions.

False (B)

What is formed when amphoteric hydroxides are dissolved in an excess of NaOH?

Colorless hydroxo complexes

Match the following amphoteric hydroxides with their corresponding hydroxo complexes:

<p>Pb(OH)2 = [Pb(OH)3]− Al(OH)3 = [Al(OH)4]− Sb(OH)3 = [Sb(OH)4]− Zn(OH)2 = [Zn(OH)3]−</p> Signup and view all the answers

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Study Notes

Amphoteric Hydroxides

  • Amphoteric hydroxides are formed when metal ions react with hydroxide ions.
  • These hydroxides can act as both acids and bases.
  • They are slowly dissolved in excess 2 M NaOH.
  • The following metal ions form amphoteric hydroxides:
    • Pb²⁺
    • Al³⁺
    • Sb³⁺
    • Zn²⁺
  • When dissolved in excess NaOH, these ions form colorless solutions called hydroxo complexes.
  • Examples of hydroxo complexes:
    • [Pb(OH)₃]⁻
    • [Al(OH)₄]⁻
    • [Sb(OH)₄]⁻
    • [Zn(OH)₃]⁻

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