A Foundation Course in Chemistry for Students of Agriculture And Technology
The book A Foundation Course in Chemistry for Students of Agriculture And Technology was written by author J W Dodgson Here you can read free online of A Foundation Course in Chemistry for Students of Agriculture And Technology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Foundation Course in Chemistry for Students of Agriculture And Technology a good or bad book?
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Most of the sulphates are soluble in water, the exceptions being those of lead, silver, and calcium, which are only slightly soluble, and those of strontium and barium. 2 When sulphates are heated with charcoal they are reduced to sulphides (p. 81). When ferrous sulphate, FeSO 4 . 7H 2 O (p. 200), is strongly heated in the air it is oxidised and decomposed, and sulphur trioxide is evolved 2FeSO 4 +>*-> Fe 2 O 3 -f 2SO 3 The sulphur trioxide combines with the water, which is also given off to fo...rm an acid of approximately the composition 1 Care must be taken in diluting concentrated sulphuric acid with water ; it is always advisable to add the acid to the water. 2 BaSO 4 is almost completely insoluble in pure water. SULPHUR H 2 S 2 O 7 . This acid is the original " Oil of Vitriol " ; it gives off sulphur trioxide as white fumes on being heated gently, and is therefore called fuming sulphuric acid. When more water is added it forms ordinary sulphuric acid. A salt of the acid can, however, be prepared by the action of heat upon the acid sulphates 2KHSO 4 -> K 2 S 2 O 7 + H 2 O Because they are produced by the action of heat, these salts are called pyrosulphates and the acid 1 pyrosulphuric acid (or disulphuric acid).
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