How to Teach Chemistry, the Substance of 6 Lectures of Edward Frankland, Summarised
- ISBN-10
- 1230163867
- ISBN-13
- 9781230163864
- Pages
- 24
- Language
- English
- Published
- 2013-09
- Publisher
- Rarebooksclub.com
- Author
- George Chaloner
Description
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1875 edition. Excerpt: ... a very slow stream of oxygen over ignited charcoal, and collecting a jar of the carbonic acid thus produced, in which magnesium may be burnt, to recover the carbon which was oxidised. The solubility of carbonic anhydride should be illustrated by a bottle of soda-water, from which by a 'champagne-tap' may be drawn more than its own volume of the gas. Here it may be explained that water dissolves an equal volume of carbonic acid gas, at whatever pressure it may happen to be; The solubility of alkaline carbonates in a solution of carbonic acid gas should be shown, and their re-precipitation on addition of lime-water. With respect to the apparent burning of magnesium and potassium in carbonic anhydride, it should be explained that this combustion is effected at the expense of the oxygen of the compound. The temperature of the heated metals must be high enough to decompose it, or the combustion will not take place. An important illustration of the volumetric composition of car-, bonic anhydride should be shown if possible. A U-shaped tube is necessary, with a bulb blown in one limb, capable of being closed by a stopper, through which pass two copper wires sustaining a deflagrating ladle of bone-earth containing a minute piece of charcoal. The bulb being filled with dry oxygen, mercury equalised in each limb, and the level marked, the charcoal is ignited by the galvanic current. The oxygen is thus converted into carbonic an hydride which on cooling is observed to occupy exactly the same volume as the original oxygen. In preparing carbonic oxide great care should be taken to remove all carbonic anhydride, especially from those jars of the gas designed to show its want of action upon lime-water. When preparing it by the action ot sulphuric upon...
