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Firstly then you notice, when a fragment of sodium is placed in a platinum spoon and introduced into a Bunsen's flame, an intensely yellow light is produced. It corresponds in refrangibility with the yellow band of the spectrum. Like our tuning-fork, it emits waves of a special period.
I might terminate these geological sketches by enquiring into the nature of the combustible which has fed for so many thousands of years the fire of the peak of Teneriffe; I might examine whether it be sodium or potassium, the metallic basis of some earth, carburet of hydrogen, or pure sulphur combined with iron, that burns in the volcano; but wishing to limit myself to what may be the object of direct observation, I shall not take upon me to solve a problem for which we have not yet sufficient data.
Darwin obtained these results, fourteen years ago, he could claim for Drosera a power and delicacy in the detection of minute quantities of a substance far beyond the resources of the most skillful chemist; but in a foot-note he admits that "now the spectroscope has altogether beaten Drosera; for, according to Bunsen and Kirchhoff, probably less than the 1/200000000 of a grain of sodium can be thus detected."
Kirchhoff knew that this was an action not peculiar to the sodium flame, and he immediately extended his generalisation to all coloured flames which yield sharply defined bright bands in their spectra.
Sodium is called natrium in Latin, and Na is the symbol used in English to be in harmony with all other languages, for practically all use the same chemical symbols. Sodium and potassium are very similar elements in some respects, and in the free state they are very peculiar, apparently taking fire when thrown into water. Chlorin in the free state is a poisonous gas.
It should be added in slight excess only, since the excess must be removed by boiling, which is tedious. !Method C! PROCEDURE. Weigh out into 500 cc. beakers two portions of 0.175-0.200 gram each of pure arsenious oxide. Dissolve each of these in 10 cc. of sodium hydroxide solution, with stirring. Cover the beakers before adding the bicarbonate, to avoid loss.
P. got himself analysed that day by Dr. ALLEN, and he was found to consist principally of carbonate of Lime; Silicate of Potassa; Iodide of Magnesia; and Chloride of Sodium; with a strong trace of Sulphate of Strontia. At night, however, he was able to attend the hop in the grand saloon. For a time Mr. P. danced with one girl right along.
Prominences are classified, according to their form, into "flame" and "cloud" prominences, the spectrum of the latter showing calcium, hydrogen, and helium; that of the former including a number of metals. The D line of sodium is a double line, and in the same eclipse an orange line was noticed which was afterwards found to lie close to the two components of the D line.
Allow the blood to remain a short time; then wash it off with a stream of distilled water, when a blue spot upon a red or violet ground will be seen, indicating its alkaline reaction, due chiefly to the sodium phosphate and sodium carbonate. Experiment 94. Place on a glass slide a thin layer of defibrinated blood; try to read printed matter through it. This cannot be done. Experiment 95.
Excellent salt is found at Gondokoro, real chloride of sodium; and this article enables the natives of that district to trade with the interior, where salt is extremely rare and of great value.
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