Specification Point 2.38:
Know that metal Oxides, Metal Hydroxides and Ammonia can act as bases, and that alkalis are bases that are soluble in water

Oxides, Metal Hydroxides & Ammonia

Alkali: Bases that are soluble in water and dissolves to form hydroxide ions OH

pH of Bases, Edexcel IGCSE Chemistry

The pH of Bases (Alkali)

Metal Oxides can act as a base and is soluble in water

Metal Oxide    +    Acid   →    Salt    +    Water

Example: Metal Hydroxides

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

Metal Hydroxide    +    Acid   →    Salt    +    Water

Example: Ammonia

Ammonia can act as a base and is soluble in water

Ammonia    +    Acid   →    Salt    +    Water

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Author: Jamie

Jamie got a First class degree in Chemistry from Oxford University before going on to teach chemistry full time as a professional tutor. He’s put together these handy revision notes to match the Edexcel IGCSE Chemistry specification so you can learn exactly what you need to know for your exams.