What is an oxide? An oxide is a Binary compound of oxygen and another element. M & O Oxides can be...
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Transcript of What is an oxide? An oxide is a Binary compound of oxygen and another element. M & O Oxides can be...
What is an oxide?
An oxide is a Binary compound of oxygen and another element.
M & OOxides can be classified in two
ways –
1.Nature of Oxides
2.Amount of Oxygen present
Most oxides can be grouped into four types:
1. acidic oxides
2. basic oxides
3. amphoteric oxides
4. neutral oxides
1. Types of Oxides based on their nature
1. 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
Acidic oxides
• React with basic oxides to produce salts
SiO2 + MgO MgSiO3
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.