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

Reactants:

• 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.]
• KOH – Potassium 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.]

Products:

• K₃PO₄ – Potassium phosphate , Potassium tetraoxidophosphate(3−)
  • Other names: Tripotassium phosphate , Tribasic , Tribasic potassium phosphate
  • Appearance: White deliquescent powder
• H₂O – Water, 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