Читать книгу The Easiest Way to Understand Chemistry. Chemistry Concepts, Problems and Solutions - Sergey D Skudaev - Страница 4

In reaction with water metals or metal oxides produce a base:

2Na +2H2O = 2NaOH + H2

CaO + H2O = Ca (OH) 2

Bases dissociate in water and produce a negative hydroxide OH – ion.