Oxalic acid standardisation? Theory is, you dissolve exact weight in distilled water, titrate with KMnO4 until pale pink stays. But our college lab's weighing scale is rusty, and the distilled water drum has algae in summer. My readings never match. So I use our borewell water's hardness to test myself—if I can get a consistent error, I know my technique is steady. Sometimes the land teaches you more than the book.
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