MgO + 2 HCl → MgCl2 + H2O – Balanced equation

Or you want a quick look:

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


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  • MgOMagnesium oxide
    • Other names: Magnesia , Periclase , Magnesium oxide fume
    • Appearance: White powder ; Hygroscopic fine white powder ; Finely divided white particulate dispersed in air. [Note: Exposure may occur when magnesium is burned, thermally cut, or welded upon.]
  • HClChlorane , Hydrogen chloride
    • Other names: Hydrochloric acid , M , Uriatic acid
    • 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.]


  • MgCl2
    • Names: Magnesium chloride , Magnesium dichloride , Magnesium chloride anhydrous
    • Appearance: White or colourless crystalline solid ; Deliquescent white solid in various forms
  • H2OWater, oxidane
    • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas
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