3 Na₂CO₃ (aq) + 2 H₃PO₄ (aq) → 2 Na₃PO₄ (aq) + 3 H₂O (l) + 3 CO₂ (g)

This is an acid-base reaction (neutralization): Na₂CO₃ is a base, H₃PO₄ is an acid.

This is a gas evolution reaction, CO₂ is the formed gas.

Reactants:

• Na₂CO₃ – Sodium carbonate
  • Other names: Soda ash , Washing soda , Soda crystals ... show moreSodium carbonate (anhydrous) , Na2CO3 , Disodium carbonate , Natriumkarbonat , Carbonic acid sodium salt (1:2) , Anhydrous sodium carbonate , Carbonic acid, disodium salt , Sodium carbonate, anhydrous , Soda-ash , Natrum carbonicum , Sodium carbonate anhydrous , Sodium salt of carbonic acid , Carbonic acid disodium salt show less
  • Appearance: White solid, hygroscopic ; White hygroscopic powder
• H₃PO₄
  • Names: Phosphoric acid , Orthophosphoric acid , Phosphoric(V) acid ... show moreWhite phosphoric acid , [PO(OH)3] , H3PO4 , E338 , Phosphoric acid (aqueous) show less
  • Appearance: Hygroscopic colourless crystals ; Thick, colorless, odorless, crystalline solid. [Note: Often used in an aqueous solution.]

Products:

• Na₃PO₄ – Trisodium phosphate
  • Other names: Sodium phosphate tribasic , Trisodium phosphate (anhydrous) , Tribasic sodium phosphate ... show moreTribasic sodium orthophosphate , Tertiary sodium phosphate , Sodium orthophosphate , Phosphoric acid trisodium salt , Na3PO4 , Sodium phosphate, tribasic , Sodium phosphate , Na₃PO₄ , Anhydroustribasicsodium phosphate , E339iii , E339(iii) , Tert-sodium phosphate , Trisodium orthophosphate show less
  • Appearance: Colourless-to-white hygroscopic crystals
• H₂O – Water, oxidane
  • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide ... show moreDihydrogen monoxide (DHMO) (systematic name) , Hydrogen monoxide , Dihydrogen oxide , Hydric acid , Hydrohydroxic acid , Hydroxic acid , Hydrol , Μ-oxido dihydrogen , Κ1-hydroxyl hydrogen(0) show less
  • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas
• CO₂
  • Names: Carbon dioxide , {{plainlist| , CO2 ... show moreCarbonic acid gas , Dry ice , [CO2] , Carbonic anhydride , R-744 , E-290 , E 290 , E290 , Carbonic acid anhydride , Carbon-12 dioxide , Methanedione , Carbon oxide , CO₂ , [Note: Normal constituent of air (about 300 ppm)]. show less
  • Appearance: Colorless gas ; Odourless colourless compressed liquefied gas ; Colorless, odorless gas. [Note: Shipped as a liquefied compressed gas. Solid form is utilized as dry ice.]