What is the role of EDTA and H3PO4 in the stabilization of commercialy used (3% solution) hydrogen peroxide?

1 Answer
Ernest Z.
Jan 5, 2018

They bind to the metal ions that catalyze the decomposition of hydrogen peroxide.

Explanation:

Cations like #"Fe"^"2+", "Cu"^"2+"#, and #"Mn"^"2+"# catalyze the decomposition of hydrogen peroxide.

EDTA is a chelating agent. It forms complexes with these ions and prevents their catalytic action.

Phosphoric acid is a sequestering agent. It binds many divalent cations.

These include #"Fe"^"2+", "Cu"^"2+"#. and #"Mn^2"+"#, so phosphoric acid also acts as a stabilizer for hydrogen peroxide.

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