A Text book of Quantitative Chemical Analysis By Gravimetric Electrolytic Volu
A Text book of Quantitative Chemical Analysis By Gravimetric Electrolytic Volu
John C John Charles Olsen
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Will be required. 2 or 3 grams of granulated zinc are added and the flask is immediately connected with the condenser to prevent loss of ammonia from the hot alkaline solution. The distillation of the ammonia in the first flask is begun immediately, and the acid in the other flasks is diluted, transferred, and neutralized in rotation. 399- Titration. When about 150 c. C. Of distillate has passed into the first Erlenmeyer flask, it is replaced by a small beaker containing a little of the indicat...or. If 10 or 15 c. C. Of the distillate does not react alkaline with the indicator, 2 or 3 drops of the cochineal are added to the solution in the Erlenmeyer flask and the excess of acid titrated with the standard alkaline solution. If the latter has not been compared within a day or two with the standard acid, a measured volume must be titrated against the acid. The other Erlenmeyer flasks should be removed and the solu- tions titrated in the order in which the acid solutions were transferred to the distillation-flasks.
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