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A System of Physical Chemistry Volume 1 (Paperback) Loot Price: R644
Discovery Miles 6 440
A System of Physical Chemistry Volume 1 (Paperback): William Cudmore McCullagh Lewis

A System of Physical Chemistry Volume 1 (Paperback)

William Cudmore McCullagh Lewis

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Loot Price R644 Discovery Miles 6 440 | Repayment Terms: R59 pm x 12*

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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. 1921 Excerpt: ... solution during the process of titration, and hence the sharper will the end point be. Very marked weakness alone, however, is not the deciding factor, as this in itself brings in certain effects, such as hydrolysis, to which reference will be made. Asa typical acid indicator we may take phenolphthalei'n. This acid is extremely weak. The undissociated molecule is colourless. When completely dissociated, say, in the form of its sodium salt, the solution is bright pink, which must be due to the anion, since Na has no colour effect in the visible spectrum. In acid solution, i.e. in presence of relatively large H' concentration, the dissociation of phenolphthalei'n will be thrown back so as to be practically undissociated, and hence the solution is colourless. In alkaline solution--excess of 0H'--the H' produced by the indicator acid will unite with 0H' to 1 The conductivity method in a modified form differing from that described has been employed.by Walker (Zeitscli. physik. Chem., 4, 333, 1889) to measure the hydrolysis of chlorides and sulphates of weak bases. give H20, and this process goes on until dissociation of the indicator is practically complete, and hence the solution is brightly coloured. Since the indicator is weak, a small drop of titrating acid or alkali will cause a sufficient change in the relative H' and 0H' concentration to cause the above marked colour change. As a typical basic indicator we may instance methyl orange. In alkaline solution the indicator is yellow, in acid, red. The yellow colour is due to the undissociated molecule, the red to the cation. Methyl orange contains a sulphonic acid group, which at first sight would lead us to think that this indicator is an acid one. That this is not the case, however, has been shown by Waddel...


Imprint: Rarebooksclub.com
Country of origin: United States
Release date: March 2012
First published: March 2012
Authors: William Cudmore McCullagh Lewis
Dimensions: 246 x 189 x 10mm (L x W x T)
Format: Paperback - Trade
Pages: 188
ISBN-13: 978-1-130-76978-4
Categories: Books
LSN: 1-130-76978-X
Barcode: 9781130769784

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