CaO + 2 HCl → H2O + CaCl2 – Balanced equation

Or you want a quick look:

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


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  • CaOCalcium oxide
    • Other names: Quicklime , Burnt lime , Unslaked lime
    • Appearance: White to pale yellow/brown powder ; White hygroscopic crystalline powder ; White or gray, odorless lumps or granular powder.
  • 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.]


  • 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
  • CaCl2Calcium chloride
    • Other names: Calcium(II) chloride , Calcium dichloride , E509
    • Appearance: White powder, hygroscopic ; Odourless hygroscopic colourless or white crystals
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