Complex Ions_ Making Chrom Alum Crystals

The preparation of hydrated chromium (III) potassium sulfate (chrom alum) crystals by the reduction of potassium dichromate with ethanol (in concentrated sulfuric acid). The video includes the practical procedure and shows the crystals growing under magnification.... The preparation of hydrated chromium (III) potassium sulfate (chrom alum) crystals by the reduction of potassium dichromate with ethanol (in concentrated sulfuric acid). The video includes the practical procedure and shows the crystals growing under magnification. The underlying redox chemistry is also addressed. This is one of a series of videos examining the chemistry of transition metals and their compounds.
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