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Write a balanced equation for when zinc metal reacts with an aqueous hydroxide ions.
A gas and a complex ion is formed

Respuesta :

Answer and explanation;

  • Zinc metal reacts with strong bases forming hydrogen gas:

Zn(s) + 2 OH−(aq) → Zn(OH)2(s) + H2(g)

  • Zn2+ is precipitated by hydroxide ions as Zn(OH)2 (white amorphous precipitate)

Zn2+(aq) + 2 OH−(aq) ⇄ Zn(OH)2 (s)

  • By acid excess hydroxide ions, the precipitate is dissolved.

Zn(OH)2(s) + 2 H+(aq) ⇄ Zn2+(aq) + 2 H2O(l)

Zn(OH)2(s) + 2 OH−(aq) ⇄ [Zn(OH)4]2−(aq)

  • [Zn(OH)4]2−(aq) is the complex ion

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