4 NaOH + 3 NaNO₃ + Fe₂O₃ → 2 H₂O + 3 NaNO₂ + 2 Na₂FeO₄

This is an oxidation-reduction (redox) reaction:

NaNO₃ is an oxidizing agent, Fe₂O₃ is a reducing agent.

Reactants:

• NaOH
  • Names: Sodium hydroxide , Caustic soda , Lye ... show moreSoda lye , Sodium hydrate , NaOH , White caustic , Lye [Sodium hydroxide] show less
  • Appearance: White, waxy, opaque crystals ; White hygroscopic solid in various forms ; Colorless to white, odorless solid (flakes, beads, granular form).
• NaNO₃ – Sodium nitrate
  • Other names: Peru saltpeter , Soda niter , Cubic niter ... show moreNitric acid sodium salt (1:1) , Sodium saltpeter , Nitric acid, sodium salt , Nitrate of soda , Nitric acid monosodium salt , Sodium(I) nitrate (1:1) , Niter , Chile saltpeter show less
  • Appearance: White powder or colorless crystals ; Colourless hygroscopic crystals
• Fe₂O₃ – Iron(III) oxide
  • Other names: Ferric oxide , Hematite , Ferric iron ... show moreRed iron oxide , Rouge , Maghemite , Colcothar , Iron sesquioxide , Rust , Ochre , Iron oxide dust and fume (as Fe) , Iron oxide red , Red oxide , Anhydrous ferric oxide , Iron (III) oxide , Diiron trioxide , Iron trioxide , Ferric sesquioxide , Iron(III) oxide [Iron oxide dust and fume (as Fe)] , Iron(III)oxide [Rouge] show less
  • Appearance: Red-brown solid ; Reddish brown-to-black crystals or powder ; Reddish-brown solid. [Note: Exposure to fume may occur during the arc-welding of iron.] ; A fine, red powder of ferric oxide. [Note: Usually used in cake form or impregnated in paper or cloth.]

Products:

• 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
• NaNO₂
  • Names: Sodium nitrite , 7632-00-0 , E250 ... show moreNaNO2 , Nitrous acid, sodium salt show less
  • Appearance: White or slightly yellowish solid ; Hygroscopic white-to-yellow solid in various forms
• Na₂FeO₄