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Elementary Qualitative Analysis; A Laboratory Guide

Elementary Qualitative Analysis; A Laboratory Guide


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER III ANALYTICAL GROUPS The elements are grouped in qualitative analysis according to their analytical reactions. The elements or combination of elements acting as one element are divided into two main divisions, one of which contains the bases and the other the acids. These divisions are each subdivided into several groups. The Bases The separation of the bases into groups is founded essentially on the solubility of the various sulphides. The first two groups of metals give sulphides insoluble in moderately dilute hydrochloric or sulphuric acids (although the first group metals are precipitated by hydrochloric acid for convenience), the third group metals give sulphides insoluble in alkaline solutions and the fourth group sulphides are soluble in both acid and alkaline solutions. The First or Hydrochloric Acid Group contains silver (Ag) and mercurows mercury (Hg), with the valence of one and lead (Pb) with the valence of two. These elements are so classified because they are precipitated from slightly acid solutions by the addition of hydrochloric acid. The Second or Hydrogen Sulphide Group contains mercuric mercury (Hg), lead (Pb), copper (Cu), cadmium (Cd) and stannous tin (Sn) with the valence oftwo, bismuth (Bi), arsenows arsenic (As) and antimon- ous antimony (Sb) with the valence of three, stannic tin (Sn) with the valence of four, and arsenic arsenic (As) and antimom'c antimony (Sb) with the valence of five. This classification is possible because of the insolubility of the sulphides in dilute acid solution which contains an excess of hydrogen sulphide. (Lead occurs in both groups due to the slight solubility of the chloride in water. In many cases it will be found in analysis in both groups and again only in one, depending on the concentration and te...


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Product Details
  • ISBN-13: 9781459044067
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 108
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1459044061
  • Publisher Date: 01 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 209 gr


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