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Updated: May 12, 2025
In solution, arsenic may be detected by the liquid tests. Sulphuretted hydrogen water gives a yellow precipitate. Marsh's Process. Put pure distilled water into a Marsh's apparatus with metallic zinc and sulphuric acid. Hydrogen is set free, and should be tested by lighting the issuing gas and depressing over it a piece of white porcelain.
"You're in the wrong joint," he said, "this ain't the Naval College." "Thank you. A submarine mine is a very ingenious affair. I've recently been reading somewhat extensively on the subject. The main charge is some high explosive, usually of the dynamite type. Above it is a small jar of sulphuric acid. Teeth, working on levers, surround this jar. The levers project outside the mine.
"You do not remember me, Herr Professor," said Marguerite, holding out her hand with a frank laugh. "You have forgotten Dresden and the chemistry classes at Fraeulein Weber's?" "No, Fraeulein; I remember those classes," the professor answered, with a grave bow. "And you remember the girl who dropped the sulphuric acid into the something of potassium?
On the same principle that electro-dissolution is used for the estimation of combined carbon in steel, etc., I have lately varied the experiment by introducing, instead of steel, iron containing a certain percentage of boron, and, having connected the respective boride with the positive pole of a powerful battery, and to the negative a plate of platinum, using as a solvent dilute sulphuric acid, I observed, after the lapse of about twelve hours, the iron had entirely passed into solution, and a considerable amount of brownish precipitate had collected at the bottom of the vessel, intercepted by flakes of graphite and carbon; the precipitate, having been collected on a filter paper, washed, and dried, on examination proved to be amorphous boron, containing graphite and other impurities, which had become chemically introduced during the preparation of the boron compound.
One of our pupils, a man past fifty, who had worked in a creamery for over twenty years, and who usually wore goggles when making tests with sulphuric acid, neglected to take the precautionary measure one morning, and some of the acid splashed up into his eyes. He is totally blind, and must begin life all over again.
Potash-saltpetre is now only employed in the manufacture of gunpowder; it is no longer in demand for other purposes; and thus, if Government effect a saving of many hundred thousand pounds annually in gunpowder, this economy must be attributed to the increased manufacture of sulphuric acid.
Another important application of sulphuric acid may be adduced; namely, to the refining of silver and the separation of gold, which is always present in some proportion in native silver. Silver, as it is usually obtained from mines in Europe, contains in 16 ounces, 6 to 8 ounces of copper.
They will not let me. Every time I try to commit suicide they hinder me. Last night I tried again. I placed a phial of sulphuric acid on the table beside my bed. In the morning it was still there. It had not killed me. They have forbidden me to drown myself. Why! I do not know why? In vain I ask the air and the trees why I should not drown myself? They do not see any reason why.
The people arose and flocked together in great fear and terror. At daybreak they went to open the grave where the wicked body of Luther had been placed. When the grave was opened, you could clearly see that there was no body, neither flesh nor bone, nor any clothes. But such a sulphuric stench rose from the grave that all who were standing around the grave turned sick.
"I don't know yet," replied Craig, finishing the annealing. The black glassy substance was now a dull grey. "What's that stuff you were putting on the wire?" I asked. "Oh, just a by-product made in the manufacture of sulphuric acid," answered Kennedy airily, adding, as if to change the subject: "I want you to go with me to-night.
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