Hydrogen peroxide decomposition reaction

I was wondering what is hydrogen peroxide decomposition reaction? why is it resulting an acidic solution (decreasing the pH from the initial pH) as they decompose over time.

Comments

  •  2 H2O2 ---UV/heat/time--> 2 H2O + O2

    Hydrogen peroxide is a weak acid, that's why the solution becomes acidic. This is more of a general chemistry question though that you could easily learn more about by googling
  • PharmaPharma Member, Pharmacist
    EVchem said:
    ...Hydrogen peroxide is a weak acid, that's why the solution becomes acidic...
    Reason has it that this would mean it becomes alkaline since the acid (H2O2) decomposes ;) .
    I don't have a definite answer but a guess: It might be stabilisers which causes the effect. H2O2 is often stabilised with a small amount phosphoric acid. Once O2 has gassed out, volume goes down and, because it's lacking a buffer, even that small a change leads to a noticeable drop in pH.
  • @Pharma that totally makes sense. thank you so much for the answer :smile:
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