ZnO + K + 2 HCl + 3 H₂O → K[Zn(H₂O)₄]Cl₂

This is an acid-base reaction (neutralization): ZnO is a base, HCl is an acid.

This is a complexation reaction: K[Zn(H₂O)₄]Cl₂ is the formed complex.

Reactants:

• ZnO
  • Names: Zinc oxide , Zinc white , Calamine ... show morePhilosopher's wool , Chinese white , Flowers of zinc , Zinc (as oxide) , Zinc paste , Zincum oxydatum , Zinkoxid , Oxyde de zinc , Zinc (as zinc oxide) , Zinci oxydum , Óxido de cinc , Zinc(II) oxide , Zinc monoxide , C.I. Pigment White 4 , Zinc peroxide show less
  • Appearance: White solid ; White powder ; White, odorless solid.
• K
  • Names: Potassium , K , Element 19 , Kalium
  • Appearance: White-to-grey lumps
• HCl – Chlorane , Hydrogen chloride
  • Other names: Hydrochloric acid , M , Uriatic acid ... show moreHydronium chloride , Chlorhydric Acid , Hydrochloric acid gas , HCl , Anhydrous hydrogen chloride , Hydrochloric acid, anhydrous , Aqueous hydrogen chloride , [Note: Often used in an aqueous solution.] show less
  • Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]
• H₂O – Water, oxidane
  • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide ... show moreDihydrogen monoxide (DHMO) (systematic name) , Hydrogen monoxide , Dihydrogen oxide , Hydric acid , Hydrohydroxic acid , Hydroxic acid , Hydrol , Μ-oxido dihydrogen , Κ1-hydroxyl hydrogen(0) show less
  • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas

Products:

• K[Zn(H₂O)₄]Cl₂