2.38: Know that Metal Oxides, Metal Hydroxides and Ammonia can Act as Bases, and that Alkalis are Bases that are Soluble in Water

ALKALI: Bases that are soluble in Water and dissolves to form Hydroxide ions (OH-)

                                Diagram showing the pH of Bases (Alkali)

Example: Metal Oxides

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Metal Oxides can act as a Base and is soluble in Water

Metal Oxide    +    Acid   →    Salt    +    Water

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Example: Metal Hydroxides

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Metal Hydroxides can act as a base and is soluble in Water

Metal Hydroxide    +    Acid   →    Salt    +    Water

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Example: Ammonia

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Ammonia can act as a base and is soluble in Water

Ammonia    +    Acid   →    Salt    +    Water