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opløsningen af jern (ii) ammoniumsulfat (3.2) titreres i forhold til kaliumdichromatopløsningen, idet der i en tilsvarende kolbe hældes samme mængder reagenser, og idet de 20 ml destillat erstattes af 20 ml destilleret vand (referencekolbe).
carry out the titration of the iron (ii) ammonium sulphate solution (3.2) with respect to the potassium dichromate solution by placing in an identical flask the same quantities of reagents but replacing the 20 ml of distillate by 20 ml of distilled water. (this is the 'control' flask.)