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Acid and Bases

Acid and Bases. -Types of Oxides-. Many acids and alkali are formed by dissolving oxides in water. At the end of this e-learning, you should able to:. Classify oxides as acidic, basic, amphoteric or neutral based on metallic/non-metallic character. What is an oxide?.

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Acid and Bases

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  1. Acid and Bases -Types of Oxides- Many acids and alkali are formed by dissolving oxides in water

  2. At the end of this e-learning, you should able to: • Classify oxides as acidic, basic, amphoteric or neutral based on metallic/non-metallic character

  3. What is an oxide? • An oxide is a compound of oxygen and another element. • Most oxides can be grouped into four types: • acidic oxides • basic oxides • amphoteric oxides • neutral oxides

  4. Acidic oxides • Oxides of non-metal • Acidic oxides are often gases at room temperature.

  5. Acidic oxides • React with water to produce acids. • Example: sulphur trioxide + water sulphuric acid SO3 + H2O H2SO4

  6. Acidic oxides • React with bases and alkalis to produce salts • Example: carbon dioxide + sodium hydroxide sodium carbonate + water CO2 + 2NaOH Na2CO3 + H2O

  7. Examples of acidic oxides

  8. Basic oxides • Oxides of metal • Basic oxides are often solids at room temperature. • Most basic oxides are insoluble in water. Calcium oxide (quicklime)

  9. Basic oxides • React with acids to produce salts and water only. • Example: Magnesium oxide + hydrochloric acid magnesium chloride + water MgO + 2HCl MgCl2 + H2O This is a neutralisation reaction

  10. Examples of basic oxides

  11. Amphoteric oxides • Oxides of metal • Can behave as acidic oxides or as basic oxides Zinc oxide

  12. hydrochloric acid aluminium chloride aluminium oxide + + water aluminium oxide sodium hydroxide sodium aluminate + water + Amphoteric oxides • React with acids and alkalis to produce salts • Example: aluminium oxide (Al2O3) • aluminium oxide as a base • aluminium oxide as an acid

  13. Neutral oxides • Non-metals that form oxides that show neither basic nor acidic properties. • Insoluble in water.

  14. Examples of neutral oxides

  15. How can we classify an unknown oxide? First question: Does the oxide dissolve in acid? YES NO

  16. It is either a basic or amphoteric oxide. Next question: Is the oxide soluble in alkali? Soluble Insoluble

  17. It is either an acidic or neutral oxide. Next question: Is the oxide soluble in alkali? Soluble Insoluble

  18. Amphoteric oxide What is an amphoteric oxide? Back to first question

  19. Basic oxide What is a basic oxide? Cook an egg with calcium oxide Back to first question

  20. Acidic oxide What is an acidic oxide? How does acidic oxide affects the atmosphere? Back to first question

  21. Neutral oxide What is an neutral oxide? Back to first question Back to the first slide

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