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Make dragendorff s reagent from bismuth nitrate
Dragendorff’s reagent is a color reagent to detect alkaloids in a test sample. Alkaloids, if present in the solution of sample, will react with Dragendorff’s reagent and produce an orange or orange red precipitate.
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Composition
Dragendroff’s reagent is a solution of potassium bismuth iodide prepared from basic bismuth nitrate (Bi(NO3)3), tartaric acid, and potassium iodide (KI).
References
Dragendorff's reagent Wikipedia(Text) CC BY-SA