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A conical flask has a narrow neck and a wider body that permits swirling a chemical solution, as in a redox titration.

A salt of potassium cations and permanganate anions, supplying permanganate in a redox titration.

A redox titration adds a measured amount of substance of one reactant to determine another through a known redox chemical equation. The burette reading becomes an amount through concentration; the balanced chemical equation supplies the amount ratio. A colour endpoint additionally needs a chemical explanation, as in the permanganate-iron titration.