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Electron bookkeeping — oxidation numbers and redox titrations.
A redox reaction is a transfer of electrons, and a redox titration counts them drop by drop. These simulations run a permanganometric titration on the bench: fill the burette with deep-purple potassium permanganate, warm the oxalic acid in the flask, and titrate until the very first drop stays pink — the self-indicating end point. Balance the 2 : 5 half-reactions, read the equivalence volume, and find the unknown concentration.
Beyond the open showcase, subscribed schools get the growing library of Redox Reactions experiments — searchable, tagged by concept and difficulty, and expanding continuously.