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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

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

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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Description

This quiz explores the definition and characteristics of amphoteric hydroxides. Learn how these compounds react with metal ions and hydroxide ions, and identify the ions that form hydroxo complexes. Test your understanding of examples and properties associated with amphoteric hydroxides.