Select Methods in Chemical Analysis
Format: Paperback
ISBN13: 9780217046213
Paperback|9780217046213
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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: water should be colourless, and free from calcic and magnesic carbonates. Any tint which is appreciable in a stratum 6 or 8 inches thick would obviously vitiate the result of a colour-test, whilst, if carbonates of calcium or magnesium be present, the addition of the Nessler solution will infallibly produce turbidity; moreover, we find that the slightest opalescence in the water, under these circumstances, is absolutely incompatible with an accurate determination. Both these difficulties may be effectually removed by adding to the water, first, a few drops either of perchloride of iron or chloride of aluminium in solution, and then a few drops of a solution of carbonate of soda, so as to precipitate sesquioxide of iron or alumina. The precipitate completely decolourises the water, and no turbidity is caused by the subsequent addition of the Nessler solution; but, unfortunately, the precipitate carries down with it an amount of ammonia which, in the case of the sesquioxide of iron, sometimes amounts to one-third of the total quantity present. Remembering the beautiful blue-green tint?the natural colour of absolutely pure water?which is presented by a reservoir of water that has been softened by Clark's process, Messrs. Frankland and Armstrong tried upon peaty water the effect of precipitating in it carbonate of lime, and found that the decolourisation was as complete as could be desired, and that no appreciable amount of ammonia was carried down with the precipitate. The amount of carbonate of lime present in a coloured water is rarely sufficient to enable the operator to carry out this reaction with sufficient rapidity and completeness; it is therefore best in all cases to add a few drops of a concentrated solution of chloride of calcium to half a litre of the water. The subseque...
| ISBN-13 | 9780217046213 |
|---|---|
| ISBN-10 | 0217046215 |
| Weight | 1.53 Pounds |
| Dimensions | 9.00 x 6.00 x 1.06 In |
| List Price | $28.85 |
| Format | Paperback |
|---|---|
| Pages | 476 pages |
| Publisher | |
| Published On | 2009-08-01 |
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