Metal oxides and metal hydroxides are bases.
1) some metal oxides and metal hydroxides dissolve in water. These soluble compounds are alkalis.
2) even bases that won't dissolve in water still react with acids.
3) all metal oxides and metal hydroxides react with acids to form salt and water.
acid + metal oxide/hyrdoxide = salt + water
hydroxide ions make solutions alkaline. Hydrogen ions make solutions acidic, if dissolved in water.
Neutralisation: H+(aq) + OH-(aq) + H2O(l)
Ammonia can be neutralised with HNO3 to make fertiliser. Ammonia dissolves in water to make an alkaline solution. When it reacts with nitric acid, you get a neutral salt - ammonium nitrate. No water is produced. Ammonium nitrate is a good fertiliser because it has nitrogen from two sources - it has a double dose, and plants need nitrogen to make proteins.
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