A text book of chemistry, for the use of students of the Cincinnati veterinary college by Schroeder John Henry 1876-

Author:Schroeder, John Henry, 1876- [from old catalog]
Language: eng
Format: epub
Tags: Chemistry
Publisher: [Cincinnati?]
Published: 1907-03-25T05:00:00+00:00

— 48 —

(= found). Then, the molecular weight of NaCl is (Na 23 + CI 35.37)=58.37.

35.37 : 58.37 : : 0.3537 : X =0.58S' N"aCl.

Volumetric Analysis.

This method of quantitative analysis measures by volum the quantity of the substances.

When an acid is thus determined, it is acidimetry; when an alkali is so determined is is alkalimetry.

The underlying principles of the method are the following, as shown in the volumetric estimation of HCl: NaOH+HCfcNaCl+H^O. 40+36.37=58.37+18. That is, one molecule, or 40 parts, of NaOH^ will neutralize 1 molecule HCl of 36.37 parts. A solution is therefore prepared containing 40 grams NaOH in 1000 Cubic centimeters. This is called a "Normal" solution.

The whole amount would neutralize then 36.37 grams HCl, or 1 Cubic centimeter 1/1000 of 36.37 HCl, or 0,03637 grams.

The normal solution of NaOH is now added to the solution of HCl until it is neutralized; every cubic centimeter equals 0,03637 HCl. To determine when the neutral point has been reached, an indicator is used, such as litmus, or phenolphthalein.

Note: A normal solution contains the molecular weight in grams to 1000 cubic centimeter; a deci-normal solution 1/10 the molecular weight. Moreover, the molecular weight is divided by the acidity of the base, or basisity of the acid, thus H2SO4 contains ^ the molecular weight to the liter, it having 2 replaceable H, dibasic.

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