How do you determine which oxidizing agent is stronger?

2 Answers
Dec 26, 2016

Look at the electronegativity values.


Oxidation is the removal of electrons from an atom or polyatomic ion.

The higher the electronegativity the greater the pull an oxidizing agent has for electrons. The higher the pull for electrons the stronger the oxidizing agent. So the element with the highest electronegativity is the strongest oxidizing agent.

Dec 26, 2016

You compare their standard reduction potentials.


For example, potassium permanganate and hydrogen peroxide are oxidizing agents. Which is stronger?


Look up their standard reduction potentials. We find

#"Half-Reaction"color(white)(mmmmmmmmmmmmmmmmmmmll) E^°//V#
#color(white)(l)"H"_2"O"_2"(aq)" + "2H"^"+""(aq)" + "2e"^"-" → "2H"_2"O(l)";color(white)(mmmmmmml)1.77#
#"MnO"_4^"-""(aq)" + "8H"^"+""(aq)" + "5e"^"-" → "Mn"^"2+""(aq)" + "4H"_2"O(l)"; color(white)(m)1.51#

The one with the more positive reduction potential is the stronger oxidizing agent.

Thus, hydrogen peroxide is the stronger oxidizing agent.