Organic Analysis a Manual of the Descriptive And Analytical Chemistry of Certai
Organic Analysis a Manual of the Descriptive And Analytical Chemistry of Certai
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Sulphuric acid gives no color ; Froehde's reagent, a greenish color. Iodide of po- tassium causes in neutral solutions of quinidine salts a crystal- line precipitate of quinidine hydriodide, C 20 H 24 N 2 O 2 HI, soluble in 1250 parts of water at 15 C. (DE YKIJ)? Immediate precipi- tation is obtained only in somewhat concentrated solution, and is incomplete. Full crystallization within the limit of solubility is obtained by warming the mixture and stirring it with a glass rod from time to time ...as it cools, then leaving some hours at a low temperature, stirring at intervals. The reagent should be neutral, and added in such proportion that the quantity of solid potassium iodide shall nearly equal the quantity of alkaloid in solution. The crystals slowly formed in dilute solutions are leaf-form. In acidulous mixtures of sufficient concentration bihydriodide of quinidine is formed, in golden crystals, soluble in 90 parts of water at 15 C. (DE YRIJ). With the alkalies and alkali carbo- nates quinidine gives nearly the same reactions as quinine, the precipitate being very much less soluble in excess of ammonia.
What to read after Organic Analysis a Manual of the Descriptive And Analytical Chemistry of Certai?
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To quickly assess the difficulty of the text, read a short excerpt:
Sulphuric acid gives no color ; Froehde's reagent, a greenish color. Iodide of po- tassium causes in neutral solutions of quinidine salts a crystal- line precipitate of quinidine hydriodide, C 20 H 24 N 2 O 2 HI, soluble in 1250 parts of water at 15 C. (DE YKIJ)? Immediate precipi- tation is obtained only in somewhat concentrated solution, and is incomplete. Full crystallization within the limit of solubility is obtained by warming the mixture and stirring it with a glass rod from time to time ...as it cools, then leaving some hours at a low temperature, stirring at intervals. The reagent should be neutral, and added in such proportion that the quantity of solid potassium iodide shall nearly equal the quantity of alkaloid in solution. The crystals slowly formed in dilute solutions are leaf-form. In acidulous mixtures of sufficient concentration bihydriodide of quinidine is formed, in golden crystals, soluble in 90 parts of water at 15 C. (DE YRIJ). With the alkalies and alkali carbo- nates quinidine gives nearly the same reactions as quinine, the precipitate being very much less soluble in excess of ammonia.
What to read after Organic Analysis a Manual of the Descriptive And Analytical Chemistry of Certai?
You can find similar books in the "Read Also" column, or choose other free books by Zed20standards3b20forensic20examinations20for to read onlineMoreLess
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