Extracting antimony
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on 12-13-2013 at 01:59 PM (50182 Views)
Some antimony ore was crushed and then mixed with KOH in a porcelain crucible. Then it was heated till the KOH melted and a yellowness (sulfur) was extracted out of antimony. The contents were left to solidify, and then crushed to little pieces. Half of them were extracted with vinegar, the rest of them with alcohol. The vinegar gave no color upon extraction. The alcohol gave an interesting orange color within one day of digestion.
It is known that alcohol when digested with KOH, can give a yellow color, even if no antimony is present. A possible explanation is that the alcohol self condenses in the strong alkaline environment created by KOH. It is known also that potassium ethoxide may be formed, which appears yellow or even red for some reason.