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A-Level Biology OCR A

Carbonic H Acid Ions Form Hydrogencarbonate Dissociates Describe

Front Describe what happens when CO2 diffuses from body cells to RBC and forms carbonic acid.
Back Dissociation of carbonic acid to form hydrogencarbonate ions and H+:


  • Carbonic acid (formed from reaction between H2O and CO2 catalysed by carbonic anhydrase) dissociates into H+ and HCO3-
  • Hydrogencarbonate ions diffuse out of RBC, Cl- ions enter cell to maintain charge - chloride shfit
  • Oxyhaemoglobin dissociates under influence of H+ ions - Bohr effect
    • Assisted by higher temp and lower pH
  • Haemoglobin binds to H+ to form haemoglobinic acid

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