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Introductory Notes on Quantitative Chemical Analysis

Charles William Foulk

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Description:This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910. Excerpt: ... IX. DETERMINATION OF THE TOTAL OXIDIZING POWER OF PYROLUSITE. The mineral pyrolusite is the naturally occurring manganese dioxide, MnO2. It is not pure but contains small amounts of other reducible oxides together with some silicious matter. The titration of such material gives the sum of all its reducible constituents, but since in its industrial application, only the total oxidizing power is wanted, no attempt is made to separate them. Just as in the case of soda ash (page 165), the titration of the mixture is made and the result stated in terms of the most important constituent, in this case the MnO2. According to the method as given below, the sample is first boiled in a flask with concentrated hydrochloric acid whereby the oxides of manganese are reduced and an equivalent amount of chlorine set free. This chlorine is conducted into a solution of potassium iodide where it liberates iodine, which is then titrated with standard thiosulphate solution. The reactions involved are as follows: I. MnO2 + 4HCI = MnCl2 + 2CI + 2H2O. II. CI + KI--KC1 + I. III. 2l + 2Na2S2O2 = 2NaI + Na2S4O0. The relation between the thiosulphate and the manganese dioxide is readily worked out by observing that 2Na2S2O2 = 2I = 2CI = MnO2. Hence, 2Na2S2O2 = MnO2. If, however, the thiosulphate solution is on the normal basis, the relation can be found more simply. (See 107.) One cubic centimeter of a 0.1N Na2SjO., will correspond to I cc. of a 0.1N MnO2. The manganese in MnO2 (reaction I. above) changes 2 in valence, therefore the mol divided by 2 gives the amount per liter for normal. (See 107, 7 for factor weights.) A new point in manipulation is brought out in this method, namely, the separation and quantitative handling of a gas. This involves a special apparatus the constructi...We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Introductory Notes on Quantitative Chemical Analysis. To get started finding Introductory Notes on Quantitative Chemical Analysis, you are right to find our website which has a comprehensive collection of manuals listed.
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Pages: —

Format: PDF, EPUB & Kindle Edition

Publisher: General Books

Release: 2012

ISBN: 1150672048

Description: This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910. Excerpt: ... IX. DETERMINATION OF THE TOTAL OXIDIZING POWER OF PYROLUSITE. The mineral pyrolusite is the naturally occurring manganese dioxide, MnO2. It is not pure but contains small amounts of other reducible oxides together with some silicious matter. The titration of such material gives the sum of all its reducible constituents, but since in its industrial application, only the total oxidizing power is wanted, no attempt is made to separate them. Just as in the case of soda ash (page 165), the titration of the mixture is made and the result stated in terms of the most important constituent, in this case the MnO2. According to the method as given below, the sample is first boiled in a flask with concentrated hydrochloric acid whereby the oxides of manganese are reduced and an equivalent amount of chlorine set free. This chlorine is conducted into a solution of potassium iodide where it liberates iodine, which is then titrated with standard thiosulphate solution. The reactions involved are as follows: I. MnO2 + 4HCI = MnCl2 + 2CI + 2H2O. II. CI + KI--KC1 + I. III. 2l + 2Na2S2O2 = 2NaI + Na2S4O0. The relation between the thiosulphate and the manganese dioxide is readily worked out by observing that 2Na2S2O2 = 2I = 2CI = MnO2. Hence, 2Na2S2O2 = MnO2. If, however, the thiosulphate solution is on the normal basis, the relation can be found more simply. (See 107.) One cubic centimeter of a 0.1N Na2SjO., will correspond to I cc. of a 0.1N MnO2. The manganese in MnO2 (reaction I. above) changes 2 in valence, therefore the mol divided by 2 gives the amount per liter for normal. (See 107, 7 for factor weights.) A new point in manipulation is brought out in this method, namely, the separation and quantitative handling of a gas. This involves a special apparatus the constructi...We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Introductory Notes on Quantitative Chemical Analysis. To get started finding Introductory Notes on Quantitative Chemical Analysis, you are right to find our website which has a comprehensive collection of manuals listed.
Our library is the biggest of these that have literally hundreds of thousands of different products represented.

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Introductory Notes on Quantitative Chemical Analysis

Introductory Notes on Quantitative Chemical Analysis

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