Electrolytic Preparations Exercises for Use in the Laboratory By Chemists And E
Electrolytic Preparations Exercises for Use in the Laboratory By Chemists And E
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Finally the pasty contents of the cathode chamber are quickly filtered off, washed with dilute acetic acid, then with alcohol, and afterwards with petroleum ether and dried. The filtrate is collected in a large filter flask containing 200 c. C. Water and a few drops of ammonium sulphide; in this way a second less pure fraction of hydrazobenzene is precipitated, which is treated as the direct crystalline product. Current- efficiency over 80 per cent. ; total yield of material over 90 per cent, o...f the theory.
For the preparation of benzidine, the cell is not cooled during the passage of the last \ ampere hour of current; EXAMPLES FROM ORGANIC CHEMISTRY 83 finally some drops of sodium bisulphite solution are added to the cathode chamber, the contents of which are then syphoned off, without breaking the current, into a dish containing a hot mixture of 200 c. C. Concentrated sulphuric acid and 400 c. C. Of water. The neutralization of the alkaline liquid and the transformation of hydrazobenzene into benzidine sulphate proceeds, accompanied by violent boiling.
What to read after Electrolytic Preparations Exercises for Use in the Laboratory By Chemists And E?
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To quickly assess the difficulty of the text, read a short excerpt:
Finally the pasty contents of the cathode chamber are quickly filtered off, washed with dilute acetic acid, then with alcohol, and afterwards with petroleum ether and dried. The filtrate is collected in a large filter flask containing 200 c. C. Water and a few drops of ammonium sulphide; in this way a second less pure fraction of hydrazobenzene is precipitated, which is treated as the direct crystalline product. Current- efficiency over 80 per cent. ; total yield of material over 90 per cent, o...f the theory.
For the preparation of benzidine, the cell is not cooled during the passage of the last \ ampere hour of current; EXAMPLES FROM ORGANIC CHEMISTRY 83 finally some drops of sodium bisulphite solution are added to the cathode chamber, the contents of which are then syphoned off, without breaking the current, into a dish containing a hot mixture of 200 c. C. Concentrated sulphuric acid and 400 c. C. Of water. The neutralization of the alkaline liquid and the transformation of hydrazobenzene into benzidine sulphate proceeds, accompanied by violent boiling.
What to read after Electrolytic Preparations Exercises for Use in the Laboratory By Chemists And E?
You can find similar books in the "Read Also" column, or choose other free books by Karl Elbs to read onlineMoreLess
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