H3PO4 + 3 KOH → K3PO4 + 3 H2O – Balanced equation

Or you want a quick look:

This is an acid-base reaction (neutralization): H3PO4 is an acid, KOH is a base.


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  • H3PO4
    • Names: Phosphoric acid , Orthophosphoric acid , Phosphoric(V) acid
    • Appearance: Hygroscopic colourless crystals ; Thick, colorless, odorless, crystalline solid. [Note: Often used in an aqueous solution.]
  • KOHPotassium hydroxide
    • Other names: Caustic potash , Lye , Potash lye
    • Appearance: White solid, deliquescent ; White hygroscopic solid in various forms ; Odorless, white or slightly yellow lumps, rods, flakes, sticks, or pellets. [Note: May be used as an aqueous solution.]


  • K3PO4Potassium phosphate , Potassium tetraoxidophosphate(3−)
    • Other names: Tripotassium phosphate , Tribasic , Tribasic potassium phosphate
    • Appearance: White deliquescent powder
  • 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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