Acid and Bases -Types of Oxides- Many acids and alkali are formed by dissolving oxides in water.
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Transcript of Acid and Bases -Types of Oxides- Many acids and alkali are formed by dissolving oxides in water.
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?
An oxide is a compound of oxygen and another element.
Most oxides can be grouped into four types: acidic oxidesbasic oxidesamphoteric oxidesneutral oxides
Acidic oxides
Oxides of non-metalAcidic oxides are often gases at room
temperature.
Acidic oxides
React with water to produce acids.
Example:
sulphur trioxide + water sulphuric acid
SO3 + H2O H2SO4
Acidic oxides
React with bases and alkalis to produce salts
Example: carbon dioxide + sodium hydroxide sodium carbonate + water
CO2 + 2NaOH Na2CO3 + H2O
Examples of acidic oxides
Acidic OxideAcidic Oxide FormulaFormula Acid Produced with Acid Produced with WaterWater
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
Basic oxides
Oxides of metal Basic oxides are often solids at room
temperature. Most basic oxides are
insoluble in water.
Calcium oxide (quicklime)
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
Examples of basic oxides
Basic OxideBasic Oxide FormulaFormula
magnesium oxide MgO
sodium oxide Na2O
calcium oxide CaO
copper(II) oxide CuO
Amphoteric oxides
Oxides of metal Can behave as acidic oxides
or as basic oxides
Zinc oxide
Amphoteric oxides
React with acids and alkalis to produce salts Example: aluminium oxide (Al2O3)
aluminium oxide as a base
aluminium oxide as an acid
hydrochloric acid
aluminium chloride wateraluminium
oxide+ +
aluminium oxide
sodium hydroxide
sodium aluminate
water+ +
Neutral oxides
Non-metals that form oxides that show neither basic nor acidic properties.
Insoluble in water.
Examples of neutral oxides
Neutral OxideNeutral Oxide FormulaFormula
water H2O
carbon monoxide CO
nitric oxide NO
How can we classify an unknown oxide?
First question:
Does the oxide dissolve in acid?
YES NO
It is either a basic or amphoteric oxide.
Next question:
Is the oxide soluble in alkali?
Soluble Insoluble
It is either an acidic or neutral oxide.
Next question:
Is the oxide soluble in alkali?
Soluble Insoluble
Amphoteric oxide
What is an amphoteric oxide?
Back to first question
Basic oxide
What is a basic oxide?
Cook an egg with calcium oxide
Back to first question
Acidic oxide
What is an acidic oxide?
How does acidic oxide affects the atmosphere?
Back to first question
Neutral oxide
What is an neutral oxide?
Back to first question
Back to the first slide