Bases that are soluble in water are called alkalis and they dissolve in water to form alkaline solutions. For example:. Explain why all alkalis are bases, but not all bases are alkalis. Alkalis are soluble bases, but only some bases are soluble in water. Bases that dissolve in water are alkalis. A neutralisation reaction is a reaction between an acid and a base. In acid-alkali neutralisation reactions, hydrogen ions from the acid react with hydroxide ions from the alkali.
Here are the ions involved in the reaction of hydrochloric acid with sodium hydroxide solution:. This leaves:. For example:. Explain why all alkalis are bases, but not all bases are alkalis. Alkalis are soluble bases, but only some bases are soluble in water, so these are not alkalis. Zinc oxide reacts with hydrochloric acid to form zinc chloride and water. Zinc oxide is insoluble in water. State and explain whether zinc oxide is a base, an alkali, or both. Zinc oxide is a base, because it reacts with an acid to form a salt and water.
It is not an alkali because it does not dissolve in water. A neutralisation reaction is a reaction between an acid and a base. In acid-alkali neutralisation reactions, hydrogen ions from the acid react with hydroxide ions from the alkali:.
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