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Acid and Bases

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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 ... – PowerPoint PPT presentation

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Title: Acid and Bases


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
Acidic Oxide Formula Acid Produced with Water
sulphur trioxide SO3 sulphuric acid, H2SO4
sulphur dioxide SO2 sulphurous acid, H2SO3
carbon dioxide CO2 carbonic acid, H2CO3
phosphorous(V) oxide P4O10 phosphoric acid, H3PO4
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
Basic Oxide Formula
magnesium oxide MgO
sodium oxide Na2O
calcium oxide CaO
copper(II) oxide CuO
11
Amphoteric oxides
  • Oxides of metal
  • Can behave as acidic oxides
  • or as basic oxides

Zinc oxide
12
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
Neutral Oxide Formula
water H2O
carbon monoxide CO
nitric oxide NO
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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