Zinc, its oxide and hydroxide, and their amphoteric character.

Zinc is a typical active metal with amphoteric properties. Its reduction potential in an aqueous medium is E = -0.76 V. Its amphotericity is manifested in its ability to react with both acids and alkalis. Let’s write the equations for the reaction with acid and alkali separately:
Reaction equations with chloride acid:
Zn + 2HCl = ZnCl2 + H2
ZnO + 2HCl = ZnCl2 + H2O
Zn (OH) 2 + 2HCl = ZnCl2 + 2H2O
Reaction equations of sodium hydroxide:
Zn + 2NaOH + 2H2O = Na2 [Zn (OH) 4] + H2
ZnO + 2NaOH + H2O = Na2 [Zn (OH) 4]
Zn (OH) 2 + 2NaOH = Na2 [Zn (OH) 4]