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Updated: June 28, 2025
It can also be used for the determination, by titration with a standard solution of a strong acid, of the salts of very weak acids, such as carbonates, sulphides, arsenites, borates, and silicates, because the weak acids which are liberated do not affect the indicator, and the reddening of the solution does not take place until an excess of the strong acid is added.
Every oceanic creature is able to extract from the water the residuum from certain metals dissolved into particles so incalculably tiny that no chemical process could ever capture them. The carbonates of lime deposited by the rivers or dragged from the coast serve innumerable species for the construction of their coverings, skeletons, and spiral shells.
The lake water becomes more and more heavily charged with such substances as common salt and the sulphates and carbonates of lime, of soda, and of potash, and these are thrown down from solution one after another as the point of saturation for each mineral is reached. Carbonate of lime, the least soluble and often the most abundant mineral brought in, is the first to be precipitated.
In titrating solutions of alkali carbonates in the presence of phenolphthalein, the color change takes place when the carbonate has been converted to bicarbonate. In the presence of methyl orange, the color change takes place only when the carbonate has been completely neutralized. From the following data, calculate the percentages of Na CO and NaOH in an impure mixture.
Nobody ever embroidered slippers for the big foot of Simon Peter, the fisherman preacher. Tea parties, with hot waffles, at ten o'clock at night, make namby-pamby ministers; but good hours and substantial diet, that furnish nitrates for the muscles, and phosphates for the brain, and carbonates for the whole frame, prepare a man for effective work.
In this instance we must suppose the deposition of a series of minor layers, first forming the stratum b, and afterwards the incumbent stratum a; then a movement of the particles took place, and the carbonates of lime and magnesia separated from the more impure and mixed matter forming the still unconsolidated parts of the stratum.
It's a curious double picture, if one could but conjure it up. On the one side, the high-born bucks, the mincing ladies, the scheming courtiers, pushing and planning, and striving every one of them to attain his own petty object. Then for a jump of a hundred years. What is this in the corner of the old vault? Margarine and chlesterine, carbonates, sulphates, and ptomaines!
He went to bed with dreams of vast new areas watered for summer rice, of pumping-stations lifting millions of cubic metres of water per day; of dykes to be protected by bulrushes and birriya weeds; of great desert areas washed free of carbonates and sulphates and selling at twenty pounds an acre; of a green Egypt with three crops, and himself the Regenerator, the Friend of the Fellah.
The result would be carbonates and sulphides of metals, earth, alkalies, and free quartz, but quartz and sulphides of the metals are soluble in solutions of carbonates and sulphides of the earths and alkalies, and the essential constituents of the ore might, therefore, readily be conveyed to openings in the vein where they would have been deposited on relief of pressure and diminution of temperature.
The Peruvian borax sometimes contains nitre. For testing the purity of refined borax the following simple tests will usually suffice. On passing sulphuretted hydrogen into the solution, no coloration or precipitate should be produced. Calcium Salts. The solution should not give a precipitate with ammonium oxalate solution. Carbonates.
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