Elements of inorganic chemistry : descriptive and qualitative . Occurrence. — Although sulphuric acid does notoccur in nature except in volcanic waters, it is the mostimportant acid known to the chemist and to commerce. 170 THE SULPHUR OXACIDS. Tt lias even been stated that the prosperity of a country-may be estimated by the amount of sulphuric acid whichthat country consumes. Its salts are very stable and of great value, as, for ex-ample, blue vitriol, CuS04 + 5 H20, a salt of copper usedfor galvanic batteries and many other purposes: gypsumor land plaster, CaS04 + 2H20, used by farmers as a
Elements of inorganic chemistry : descriptive and qualitative . Occurrence. — Although sulphuric acid does notoccur in nature except in volcanic waters, it is the mostimportant acid known to the chemist and to commerce. 170 THE SULPHUR OXACIDS. Tt lias even been stated that the prosperity of a country-may be estimated by the amount of sulphuric acid whichthat country consumes. Its salts are very stable and of great value, as, for ex-ample, blue vitriol, CuS04 + 5 H20, a salt of copper usedfor galvanic batteries and many other purposes: gypsumor land plaster, CaS04 + 2H20, used by farmers as a manure;green vitriol or ferrous sulphate, FeS04 + 7 H20, a well-known salt used in the laboratory as a reagent, and alsoused for purifying water-closets, sewers, etc.; Glaubersalts, Na2S04 + 10 H20 ; Epsom salts, MgS04 + 7 H20, andthe sulphates of the alkaloids used in medicine. 181. Preparation. — Exp. 121 t. Although the studentwill have this acid upon his table, where he may study itsproperties at his leisure, it might be well to illustrate the inter-. Fig. IS. esting process of its manufacture. The formation of sulphuricacid may be beautifully shown by employing the apparatusillustrated in Fig. 18. G is a glass globe used as a condensingchamber. B is a generator containing copper filings and THE SULPHUR OXACIDS. 171 sulphuric acid for the purpose of producing sulphur is a flask containing water for generating steam. A containscopper filings and nitric acid for generating nitrogen dioxideand nitrogen trioxide. D is used to convey air into the con-densing chamber, and is attached to a hand-bellows. E is anescape-pipe to allow the waste gases, nitrogen and nitrogendioxide, etc., to be forced out of the chamber. In practice mostof these gases are utilized, but in this experiment E must beplaced in a good ventilating draft. When the products of A,B, and C begin to fill the condenser, a steady, but gentle,current of air from the bellows must be forced through G- unt
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