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The platinum and carbon become incandescent, the bicarbonate is decomposed, and a fresh deposit of carbon solders the filament to its support. The system thus mounted is placed within the permanent globe, and a vacuum is obtained in the ordinary way, while the testing and finishing details present nothing of special interest.
Alkalies, whether potassium or sodium citrate or sodium bicarbonate, are often of advantage in so changing and aiding metabolism, or perhaps reducing the irritation from hyperacidity or a mild condition of acidosis, that their administration causes a lowering of blood pressure. Of course, in syphilitic sclerosis large doses of iodids are indicated and are valuable.
It is possible to dissolve the arsenious oxide directly in a solution of sodium bicarbonate, with gentle warming, but solution in sodium hydroxide takes place much more rapidly, and the excess of the hydroxide is readily neutralized by hydrochloric acid, with subsequent addition of the bicarbonate to maintain neutrality during the titration.
Thus when the salts of lead or of mercury are applied, they enter into combination with the sulphur, and a black sulphuret of the metal is formed. A common formula for a paste to dye the hair, is a mixture of litharge, slacked lime, and bicarbonate of potash. Different shades may be given by altering the proportions of these articles.
I will take some lime-water, and I will blow through; my breath contains carbonic acid, and you will see the clear liquid become milky owing to separation of insoluble carbonate of lime, or chalk. I now continue blowing, and at length that chalk dissolves with the excess of carbonic acid, forming bicarbonate of lime.
To prepare the solution, dissolve about 5 grams of the powdered oxide, accurately weighed, in 10 cc. of a concentrated sodium hydroxide solution, dilute the solution to 300 cc., and make it faintly acid with dilute hydrochloric acid. Add 30 grams of sodium bicarbonate dissolved in a little water, and dilute the solution to exactly 1000 cc. in a measuring flask.
When the iron is present as bicarbonate, it acts on soap solutions like the analogous lime and magnesia compounds, producing even worse results. In wool scouring, cotton bleaching, and other processes requiring the use of alkaline carbonates, ferric oxide is precipitated on the fibre.
Mix all and place over a gentle fire, and stir well about thirty minutes; remove from the fire and strain, and divide into two parts; into one-half put eight ounces of bicarbonate of soda, into the other half put six ounces of tartaric acid. Shake well, and when cold they are ready for use by pouring three or four spoonfuls from both parts into separate glasses, each one-third full of water.
The following is a deduction which confirms, by explaining, the old but not undisputed empirical generalization, that soda powders weaken the human system. These powders, consisting of a mixture of tartaric acid with bicarbonate of soda, from which the carbonic acid is set free, must pass into the stomach as tartrate of soda.
Various simple mouth and throat washes may be used, such as water with a little common salt dissolved in it; water containing a few drops of carbolic acid just enough to be distinctly tasted; water containing listerine; either of the last two with the addition of a pinch of bicarbonate of sodium to a teacupful of the fluid, when there is a tendency to catarrh.
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