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Makambo oyo bato mingi bakutanaka na yango ekoki kosila ndenge oyo elandi. Mpo na kokangama, beta na malɛmbɛ molangi ya réactif na mallet ya mabaya —kosalela ata moke te marto ya ebende. Langi ya molili elakisi oxydation partielle, oyo ekoki ko traité na reflux na quantité appropriée ya poudre ya soufre. Esengeli ko filtrer ba solutions ya mapata yambo ya calibration ya concentration, na kosalelaka papier filtrant quantitative malembe ya deux couches. Soki étiquette ya molangi ya réactif ya Sulfure de Sodium ekweyi, mbala moko koma yango lisusu na kosalelaka marqueur imperméable na mayi, kokoma mokolo ya bofungoli.Sulfure de sodium.