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pH <--- HUH? hehe
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Since the dissociation constant for hydrogen peroxide is 2.4 x 10^-12 (very very small) if only a 3% concentration were to be mixed with water the pH would be negligible. However the main reason Hydrogen peroxide stings when you spill or pour it on a cut to disinfect it is because of its fairly high reactivity.
The material most commonly called "hydrogen peroxide", especially by non-chemists, is a solution of the solute hydrogen peroxide in water as the solvent.
Peroxide is an compound that can be a part of another chemical to form a molecule. Hydrogen peroxide is two hydrogen atoms attached to a peroxide molecule, forming hydrogen peroxide. Peroxide itself (O2) only exists as molecular oxygen when it is not attached to another chemical.
No, hydrogen peroxide refers to the chemical compound H2O2, which is a colorless liquid. Hydrogen peroxide solution is a diluted form of hydrogen peroxide mixed with water, commonly found in concentrations of 3% or 0.5%.
Hydrogen peroxide is H2O2 For more information see related link.