Mg(OH)2 + HCl = MgCl2 + H2O

Balanced Chemical Equation – Solution

Mg(OH)2 + 2HCl → MgCl2 + 2H2O

The coefficients show the number of particles (atoms or molecules), and the indices show the number of atoms that make up the molecule. New substances are formed as a result of the rearrangement of the original atoms. As a result of a chemical reaction, atoms of chemical elements do not disappear anywhere and new ones do not appear, their number remains unchanged – this follows from the law of conservation of mass of substances.

Chemical Reaction Information

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

Brucite + Hydrogen Chloride = Magnesium Chloride + Water

Reaction Type

Double Displacement (Acid-Base)

Substances that react are called starting materials or reactants. The substances that form as a result are called reaction products.


Mg(OH)2 – Magnesium hydroxide

  • Other names: Magnesium dihydroxide.
  • Appearance: White solid.

HCl – Chlorane

  • Other names: Hydrochloric acid.
  • Appearance: Colorless, transparent liquid, fumes in air if concentrated.



  • Names: Magnesium chloride.
  • Appearance: White or colourless crystalline solid.

H2O – Water, oxidane

  • Other names: Water (H2O), Hydrogen oxide, Hydrogen hydroxide.
  • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas.
Similar Examples of Equalizing a Chemical Reaction
HCl + CaCO3 + Mg(OH)2 → H2O + CO2 + CaCl2 + MgCl2
HCl + Mg(OH)2 → H2O + MgOHCl
HCl + Mg(OH)2 → MgCl2 + HOH
HCl + Mg(OH)2 → H2O + Mg(OH)Cl
HCl + Mg(OH)2 → H2O + MgCl2

Alexander Stephenson

Candidate of Chemical Sciences, editor-in-chief of Lecturer at several international online schools, member of the jury of chemistry competitions and author of scientific articles.

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