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| Classification of Bases |
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| Bases can be classified in various ways, depending on the following factors: |
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| The strength of a base depends on the concentration of the hydroxyl ions when it is dissolved in water. |
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| Strong base |
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| A base that dissociates completely or almost completely in water is classified as a strong base. The greater the number of hydroxyl ions the base produces, the stronger is the base. |
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Example:  |
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| Weak base |
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| A base that dissociates in water only partially is known as a strong base. |
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Example:  |
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| The acidity of a base is equal to the number of hydroxyl ions it has. It is also the number of hydrogen ions with which a base can combine as one hydrogen ion combines with one hydroxyl ion. |
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| Monoacidic base |
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| It is a base that has only one hydroxyl ion. It combines with only one hydrogen ion. |
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| Example: Sodium hydroxide |
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| Monoacidic Bases |
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| Sodium hydroxide: NaOH |
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| Potassium hydroxide: KOH |
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| Lithium hydroxide: LiOH |
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| Ammonium hydroxide: NH4OH |
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| Diacidic base |
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| It is a base that has two hydroxyl groups and combines with two hydrogen ions. |
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| Example: Calcium hydroxide |
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| Diacidic Bases |
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| Calcium hydroxide: Ca(OH)2 |
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| Iron (II) hydroxide: Fe(OH)2 |
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| Magnesium hydroxide: Mg(OH)2 |
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| Copper hydroxide: Cu(OH)2 |
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| Zinc hydroxide: Zn(OH)2 |
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| Lead hydroxide: Pb(OH)2 |
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| Triacidic base |
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| A base that has three hydroxyl ions and can combine with three hydrogen ions, is known as a triacidic base. |
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| Example: Aluminium hydroxide |
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| Triacidic base |
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| Aluminium hydroxide: Al(OH)3 |
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| Iron (III) hydroxide: Fe(OH)3 |
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