KOH + H3PO4 = K3PO4 + H2O

Balanced Chemical Equation – Solution

3KOH + H3PO4 → K3PO4 + 3H2O

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): KOH is a base, H3PO4 is an acid.

Potassium Hydroxide + Phosphoric Acid = Tribasic Potassium Phosphate + Water

Reaction Type

Double Displacement (Metathesis)

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


KOH – Potassium hydroxide

  • Other names: Caustic potash.
  • Appearance: White solid, deliquescent.


  • Names: Phosphoric acid.
  • Appearance: Hygroscopic colourless crystals.


K3PO4 – Potassium phosphate

  • Other names: Tripotassium phosphate.
  • Appearance: White deliquescent powder.

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
KOH + H3PO4 → H2O + KH2PO4
KOH + H3PO4 → H2O + K3PO4
KOH + H3PO4 → H2O + K2HPO4
KOH + H3PO4 → K3PO4 + HOH
KOH + H3PO4 → H2O + KH2PO4 + K2HPO4

Alexander Stephenson

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

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