Synopses & Reviews
Synopsis
Excerpt from The Determination of Nicotin in Nicotin Solutions and Tobacco Extracts
Make the distillate to convenient volume, mix well and pass through a large dry filter, discarding a liberal first portion of the filtrate, and test a portion with methyl orange to assure its acidity. Pipette into a beaker an aliquot containing about gram nicotin, add for each 100 c. C. Of liquid 3 c. C. Of dilute hydrochloric acid (1 to 4) - Or more, if indicated necessary by the test with methyl orange - and add 1 c. C. Of a 12 per cent solution Of silicotungstic acid for each 0.01'gram nicotin supposed to be present.' Stir thoroughly and let stand for eighteen hours.2 Then stir up the precipitate, making sure that it settles quickly and completely in crystalline form; filter on a quanti tative paper, and wash with cold water containing 1 c. C. Of concen trated hydrochloric acid per liter. Test the first portion Of the filtrate with a few drops Of nicotin distillate to prove excess of silicotungstic acid.
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