A systematic handbook of volumetric analysis, or, The quantitative estimation of chemical substances by measure, applied to liquids, solids, and gases : adapted to the requirements of pure chemical research, pathological chemistry, pharmacy, metallurgy, manufacturing chemistry, photography, etc., and for the valuation of substances used in commerce, agriculture and the arts / by Francis Sutton.

  • Sutton, Francis, 1831-1917.
Date:
1882
Catalogue details

Licence: Public Domain Mark

Credit: A systematic handbook of volumetric analysis, or, The quantitative estimation of chemical substances by measure, applied to liquids, solids, and gases : adapted to the requirements of pure chemical research, pathological chemistry, pharmacy, metallurgy, manufacturing chemistry, photography, etc., and for the valuation of substances used in commerce, agriculture and the arts / by Francis Sutton. Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

    23/508 (page 7)
    §4. cannot be head as a weight, one of another kind may be used as a substitutOj and the required result obtained by calculation. For instance, it is required to ascertain the purity of a specimen of sodic carbonate, and only pure calcic carbonate is at hand to use as a weight; equal weights of the two are taken, and the impure speci- men titrated with acid. To arrive at the required answer, it is necessary to find a coefficient or factor by which to convert the number of c.c. required by the sodic carbonate, weighed on the calcic, into that which should be required if weighed on the sodic, basis. A consideration of the relative molecular Aveights of the two bodies will give the factor thus— (;alcic carbonate 100_ 09434- Sodic carbonate 106 If, therefore, the c.c. used are multiplied by this number, the percentage of pure sodic carbonate will be obtained. The method ^ may be extended to a number of substances, on this principle, with the exercise of a little ingenuity. VOLUMETRIC ANALYSIS WITHOUT BURETTES OR OTHER GRADUATED INSTRUMENTS. § 4. This operation consists in weighing the standard solutions on the balance instead of measuring them. The influence of variation in temperature is, of course, here of no consequence. The chief requisite is a delicate flask, fitted with a tube and blowing ball, as in the burette, fig. 5, or an instrument known as Schuster's alkalimeter may be used. A special burette has been devised for this purpose by Casamajor (G. N.y. xxxv. p. 98). The method is capable of very accurate results, if care be taken in preparing the standard solutions and avoiding any loss in pouring the liquid from the vessel in which it is weighed. It occupies much more time thaii the usual processes of volumetric analysis, but at great extremes of temperature it is far more accurate. THE BURETTE. § 5. Tins instrument is used for the delivery of an accurately measured quantity of any particular standard solution. It invari- ably consists of a long glass tube of even bore, throughout the length of which are engraved, by means of hydrofluoric acid, certain divisions corresponding to a known volume of fluid. It may bo obtained in a great many forms, under the names of their respective inventors, such as Mohr, Gay Lussac, Einks, etc., but as some of these possess a decided superiority over others, it is not quite a matter of indifl^erenco whicli is used, and therefore a *