6 K₄[Fe(CN)₆] + 61 K₂Cr₂O₇ + 247 H₂SO₄ → 61 Cr₂(SO₄)₃ + 3 Fe₂(SO₄)₃ + 36 KNO₃ + 55 K₂SO₄ + 36 CO₂ + 247 H₂O

This is an oxidation-reduction (redox) reaction:

K₄[Fe(CN)₆] is a reducing agent, K₄[Fe(CN)₆] is a reducing agent, K₄[Fe(CN)₆] is a reducing agent, K₂Cr₂O₇ is an oxidizing agent.

Reactants:

• K₄[Fe(CN)₆] – Potassium hexacyanidoferrate(II)
  • Other names: Potassium ferrocyanide , (Yellow) Prussiate of Potash , Potassium hexacyanoferrate (II) trihydrate ... show moreTetrapotassium ferrocyanide trihydrate , Ferrate hexacyano tetrapotassium trihydrate , Potassium hexacyanoferrate(4-) , Tetrapotassium hexacyanoferrate , K4[Fe(CN)6] show less
  • Appearance: Light yellow, crystalline granules
• K₂Cr₂O₇ – Potassium dichromate(VI)
  • Other names: Potassium dichromate , Chromium potassium oxide , Dipotassium dichromium heptaoxide ... show moreDipotassium dichromate , Dipotassium bichromate , Dichromic acid dipotassium salt , Dipotassium dichromate (VI) , Dichromic acid, dipotassium salt , Potassium bichromate show less
  • Appearance: Red-orange crystalline solid ; Orange-to-red crystals
• H₂SO₄ – Sulfuric acid
  • Other names: Oil of vitriol , Sulfuric acid, concentrated (> 51% and < 100%) , H2SO4 ... show moreSulphuric acid , Battery acid , Hydrogen sulfate , [SO2(OH)2] , [S(OH)2O2] , Sulfuric acid (aqueous) show less
  • 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.]

Products:

• Cr₂(SO₄)₃ – Chromium(III) sulfate
  • Other names: Basic chromium sulfate , Chromic sulfate
  • Appearance: Reddish-brown crystals (anhydrous), purple crystals (hydrated)
• Fe₂(SO₄)₃ – Iron(III) sulfate
  • Other names: Ferric sulfate , Sulfuric acid , Iron(3+) salt (3:2) ... show moreDiiron tris(sulphate) , Iron tersulfate , Iron sesquisulfate , Iron persulfate , Ferric tersulfate , Ferric sesquisulfate , Ferric persulfate , Diiron trisulfate , Iron(III) sulfate(VI) , Ferric sulfate anhydrous show less
  • Appearance: Grayish-white crystals
• KNO₃ – Potassium nitrate
  • Other names: Saltpeter , Saltpetre , Nitrate of potash ... show moreNitric acid, potassium salt , Niter , Salt peter , Nitre show less
  • Appearance: White solid ; Colourless-to-white crystalline powder
• K₂SO₄
  • Names: Potassium sulfate , Potassium sulphate , Dipotassium sulfate ... show moreKaliumsulfat , K2SO4 , Sulfuric acid dipotassium salt show less
  • Appearance: White solid ; Colourless-to-white crystals
• 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.]
• 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