5 H2SO4 + 2 P → 2 H3PO4 + 5 SO2 + 2 H2O – Balanced equation

Or you want a quick look:

This is an oxidation-reduction (redox) reaction:

2 P - 10 e- 2 PV (oxidation)

5 SVI + 10 e- 5 SIV (reduction)

P is a reducing agent, H2SO4 is an oxidizing agent.

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Reactants:

  • H2SO4Sulfuric acid
    • Other names: Oil of vitriol , Sulfuric acid, concentrated (> 51% and , H2SO4
    • Appearance: Clear, colorless liquid ; Odourless colourless oily hygroscopic liquid ; Colorless to dark-brown, oily, odorless liquid. [Note: Pure compound is a solid below 51°F. Often used in an aqueous solution.]
  • P

    Products:

    • 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.]
    • SO2Sulfur dioxide
      • Other names: Sulfurous anhydride , Sulphur dioxide , Sulfurous acid anhydride
      • Appearance: Colorless gas ; Colourless gas or compressed liquefied gas with pungent odour ; Colorless gas with a characteristic, irritating, pungent odor. [Note: A liquid below 14°F. 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
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