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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.
In the third case are some remarkable varieties of silicates, which contain borates from Norway and other countries; and in the fourth case are the first in order, of the carbonates, including carbonates of soda, the beautiful crystals of carbonate of baryta, carbonate of strontia and aragonites, from Aragon, Hungary, Bohemia, and Vesuvius; and in the next case are deposited further varieties of aragonite, and some remarkable varieties of calcite, or carbonate of lime.
In the second case are the Molybdates and molybdic acid; the Chromates, including red lead ore from the Siberian gold mines of Beresof; chromate of lead and copper, and crome iron from Var, in France; the Borates, including borates of magnesia, and borate of soda, or borax.
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