A Manual of Volumetric Analysis for the Use of Pharmacists Sanitary And Food Ch
A Manual of Volumetric Analysis for the Use of Pharmacists Sanitary And Food Ch
Henry W Henry William Schimpf
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Two or more titrations should be made, the first will give the approximate figure. This method depends upon the fact that when a neutral solution of mercuric chlorid is added to a solution of potassium iodid, a color- less solution is formed, until the proportion of the mercuric chlorid is to that of potassium iodid as i to 4. As soon as this proportion is exceeded, and more mercuric chlorid added, the solution is colored red through precipitation of mercuric iodid, which marks the end- reactio...n. The reagents required are: Decinormal Potassium Iodid, made by dissolving 32. 952 gms. Of the pure salt and diluting to a liter; Decinormal Mercuric Chlorid, made by dissolving 13. 443 gms. Of pure mercuric chlorid, together with about 30 gms. Of sodium chlorid (to assist solution) in water to make one liter. * Compt. Rend. , LVI, 63. 410 A MANUAL OF VOLUMETRIC ANALYSIS The mercuric chlorid to be estimated, which must be neutral, is dissolved in water and added to an excess of the decinormal potassium iodid.
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