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. 1894 edition. Excerpt: ...100 cubic centimetres capacity; they are made of thin glass, so as to weigh as little as possible. Weigh out into a from 3 to 5 grams of the powdered sample, add from 5 to 6 grams of sodium oxalate, and half fill b with strong sulphuric acid. Weigh the entire apparatus. Place a short piece of ...
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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. 1894 edition. Excerpt: ...100 cubic centimetres capacity; they are made of thin glass, so as to weigh as little as possible. Weigh out into a from 3 to 5 grams of the powdered sample, add from 5 to 6 grams of sodium oxalate, and half fill b with strong sulphuric acid. Weigh the entire apparatus. Place a short piece of caoutchouc tubing over c, and close it by a glass rod, slip a longer piece of caoutchouc tubing over e, and aspirate two or three bubbles of air from a through the sulphuric acid. On discontinuing the suction, the acid rises in the tube; if the column remains stationary, the apparatus is air-iighti Now aspirate more air from a, So as to cause a small quantity of sulphuric acid to pass over from b. Carbonic acid is immediately evolved, and is dried by passing through the sulphuric acid in b. When the evolution of gas begins to slacken, draw over in the same manner fresh quantities of the acid. The complete decomposition of the ore requires from five to ten minutes; the termination of the reaction is indicated by the appearance of the residue in a, which will no longer be black, and also from the non-evolution of carbonic acid when a fresh quantity of sulphuric acid flows over into a. Remove the glass stopper from c, and aspirate a slew current of air, dried by sulphuric acid, through the apparatus for five minutes. When the flask is cold, remove the caoutchouc tubing, re-weigh, again aspirate dry air through it, and again weigh. The two weighings ought to agree. The loss of weight indicates the amount of carbon dioxide evolved by the action of the manganese dioxide upon the oxalic acid. In the case of ores containing carbonates, treat the weighed portion in a with a little water, add two or three drops of dilute sulphuric acid, and heat on the...
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