Question

why does hydrogen peroxide decompose at higher PH levels but not at low acidic PH levels without an enzyme present?

Answer 1

Hydrogen peroxide decomposes at higher PH levels but not at low acidic PH levels without an enzyme present because during higher temperatures and pH, the most stable form of Hydrogen peroxide is dissociated. During as we go down towards the lower pH , the Pka value increases , hence weaker the acid becomes. It is a weak acid, since it has higher pKa. On in higher pH, the pKa lowers down which makes it easy for hydrogen peroxide to give easily its protons.hence its decomposition is easily at high pH levels. Same opposite happens at low pH, high pKa and this makes release of protons from hydrogen peroxide difficult.

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