An Introduction to the Practice of Commercial Organic Analysis Being a Treatis
An Introduction to the Practice of Commercial Organic Analysis Being a Treatis
Allen, Alfred Henry
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The acetic acid in the distillate is then determined by titration with decinormal caustic soda, as described on page 189. Before commencing the titration it is desirable to add a drop or two of barium chloride as a test for sulphuric acid. Any precipitate must be filtered off, and 46 parts of alcohol subtracted for every 233 of barium sulphate obtained. Each c. C. Of decinormal alkali required represents 0*0046 of real alcohol in the liquid exa- mined. In presence of acetic acid or foreign fixe...d matter, the spirituous liquid must be rendered slightly alkaline and dis- tilled, :]; the chromic acid solution being applied to the distillate or a portion of it. THE DETERMINATION OF ALCOHOL IN PRESENCE OF FIXED MATTERS cannot be effected directly by the specific gravity method, but approximate results can be obtained by several of the alternative processes already given. The indirect deter- * Larger quantities may be used if the proportions of water and oxidising mixture are duly increased.
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