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Updated: June 21, 2025
Run in the arsenite solution from a burette until no further reaction takes place on the starch-iodide paper when touched by a drop of the solution of bleaching powder. Repeat the titration, using a second 25 cc. portion.
In case of need, the ferricyanide can be purified by adding to its solution a little bromine water and recrystallizing the compound. PROCEDURE. Fill one burette with each of the solutions, observing the general procedure with respect to cleaning and rinsing already prescribed. The bichromate solution is preferably to be placed in a glass-stoppered burette.
The treatment described above will usually accomplish this, but, in the case of plain burettes it is sometimes better to allow a little of the liquid to flow out of the tip while it is bent upwards. Any air which may be entrapped then rises with the liquid and escapes. All liquids when placed in a burette form what is called a meniscus at their upper surfaces.
The acid solution may be placed in a plain or in a glass-stoppered burette as may be more convenient, but the alkaline solution should never be allowed to remain long in a glass-stoppered burette, as it tends to cement the stopper to the burette, rendering it useless. It is preferable to use a plain burette for this solution.
I shall be soft enough this time again to do just as Burette wishes, and Micou also; but he is a friend." "Never mind; the seller of old iron is a robber, just like the rest, but these rascally receivers know one has need of them," said Calabash, trying on one of the shawls, "and they abuse it." "There's nothing more," said Nicholas, reaching the bottom of the box.
PROCEDURE. Fill a glass-stoppered burette with the permanganate solution, observing the usual precautions, and fill a second burette with the ferrous sulphate solution prepared for use with the potassium bichromate. The permanganate solution cannot be used in burettes with rubber tips, as a reduction takes place upon contact with the rubber.
Many of the ancients speak of music as a recipe for every kind of malady, and it is probable that the Latin was praecinere, to charm away pain, incantare to enchant, and our own word incantation, came from the medical use of song. M. Burette, with Dr.
If the titration has occupied more than the three minutes required for draining the sides of the burette, the final reading may be taken immediately and recorded in the notebook. Refill the burettes and repeat the titration. From the records of calibration already obtained, correct the burette readings and make corrections for temperature, if necessary.
I must even do as they do, worse than they, to avoid suspicions; but it cuts me to the heart to imitate them to the heart I must be well devoted to the service to follow such a trade." "Poor dear man! I pity you with all my heart." "You laugh, M. Borel. But if all these stories are believed, why do they not pay Mother Burette and myself a visit?"
After thus fixing the precise point of the saturation of the acids, the burette is held upright, and the quantity of the solution of ammonia consumed is accurately determined, that is, to what line on the scale the burette has been emptied.
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