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Hydrogen sulphide is a weak acid, and the concentration of the hydrogen ions in its aqueous solutions is very small. By a parallel course of reasoning it will be seen that the addition of a salt of a weak acid or base to solutions of that acid or base make it, in effect, still weaker because they decrease its percentage ionization.
Rosales's theory account at all for auriferous lodes; which below water level are composed of a solid mass of sulphide of iron with traces of other sulphides, gold, calcspar, and a comparatively small percentage of silica.
He says, referring to an occurrence of a Natural Sulphide of Gold: "The existence of gold, in the form of a natural sulphide in conjunction with pyrites, has often been advanced theoretically, as a possible occurrence; but up to the present time has, I believe, never been established as an actual fact.
The prominent feature is the formation of hydrogen sulphide gas, which blackens the contents of the egg, gives the characteristic rotten egg smell and sometimes causes the equally well known explosion. Sour eggs or white rots. These eggs have a characteristic sour smell. The contents become watery, the yolk and the whites mix and the whole egg is offensive to both eye and nose. The spot rot.
Copper ores vary widely in composition from the nearly pure copper minerals, such as malachite and copper sulphide, to very low grade materials which contain such impurities as silica, lead, iron, silver, sulphur, arsenic, and antimony. In nearly all varieties there will be found a siliceous residue insoluble in acids. Chem.
Whether charcoal and sulphur will become part of the cause of gunpowder or not will depend upon the presence of the third agent; whether sulphide of iron will rank as part of the cause of sulphuric acid will depend upon the presence of oxygen. In every case it is the assemblage of appropriate factors that constitute a real cause.
The mine was abandoned, and the shafts and levels were closed by falls of rock. Some of the ore, sulphide of silver, was lying at the mouth of one of the old shafts. Our guide told us that the lode was two feet wide. Both it and the containing rock was very hard, and the miners had also water to contend against.
Whence came the metallic gold of our reefs and drifts? What was it originally a metal or a metallic salt, and if the latter, what was its nature? chloride, sulphide, or silicate, one, or all three? I incline to the latter hypothesis. All three are known, and the chemical conditions of the period were favorable for their natural production.
Silk contains nitrogen, like wool, but does it contain sulphur? The answer furnished by our tests is no! since the fibre is not coloured brown or black on heating with the alkaline lead solution. Thirdly, we try some white Berlin wool, so that we can easily see the change of colour if it takes place. In the hot lead solution the wool turns black, lead sulphide being formed.
If the solution be now added to a large bulk of water, the white oxychloride is precipitated, which is soluble in tartaric acid and precipitated orange yellow with hydrogen sulphide. The chloride of bismuth is also precipitated white, but the precipitate is not soluble in tartaric acid, and the precipitate with hydrogen sulphide is black. Tests. Soluble in water, but not in alcohol.
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