Cu(OH)₂ (s) + 2 HBr (aq) → CuBr₂ (aq) + 2 H₂O (l)

This is an acid-base reaction (neutralization): Cu(OH)₂ is a base, HBr is an acid.

Reactants:

• Cu(OH)₂ – Copper(II) hydroxide
  • Other names: Cupric hydroxide , Cu(OH)2
  • Appearance: Blue or blue-green solid
• HBr – Hydrogen bromide , Bromane
  • Other names: Hydrobromic acid , Hydronium bromide , HBr ... show moreAnhydrous hydrogen bromide , Aqueous hydrogen bromide show less
  • Appearance: Colorless gas ; Colorless/faint yellow liquid ; Colourless compressed liquefied gas with pungent odour ; Colorless gas with a sharp, irritating odor. [Note: Shipped as a liquefied compressed gas. Often used in an aqueous solution.]

Products:

• CuBr₂
  • Names: Copper (II) bromide , Cupric bromide , Copper dibromide , Copper(II) bromide
  • Appearance: Grayish black crystals | deliquescent
• 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