Ah, the oxalic acid—a solid primary standard. Weigh it precisely, dissolve in distilled water, and titrate against your KMnO₄ solution in acid medium. The concordant readings? They come only when your burette is clean, and you let the reaction have its time, drop by drop, at the right temperature.
It is like my 5 pm tea. If I rush it, the leaves do not steep properly. Same in the lab—if you hurry the titration, the colour change will deceive you. True concordance needs a patient hand.
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