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The image shows a page from a textbook opened to a section discussing tetraoxosulphate (VI) acid. The page is filled with text and chemical equations. The lighting suggests indoor illumination, likely a classroom or library, as there are no natural light cues. The page is slightly curled, indicating it's part of a physical book. Some areas of the page are slightly out of focus, suggesting the photograph was taken from an angle. There is no indication of people, weather, or time of day. Visible text includes: - "4. It is used in the purification of crude oil to remove waxes, gums and many dark coloured compounds." - "5. It is used as drying agent for many gases except ammonia and hydrogen sulphide." - "6. It is used as an electrolyte in lead accumulators and batteries." - "7. It is used in the extractions of metal by electrolysis." - "8. It is used in the manufacture of soaps and detergents." - "9. It is used in the preparation of many important chemical compounds such as hydrochloric and trioxonitrate (V) acid, metallic tetraoxosulphate (VI) and others." - "10. It is used as a dehydrating agent in the nitration of compounds used for making explosives." - "21.11 TETRAOXOSULPHATE (VI)" - "from their salts" - "(VI) acid" - "Concentrated tetraoxosulphate (VI) are the normal salts formed when all the hydrogen ions in tetraoxosulphate (VI) acid are replaced by metallic or ammonium ions. Most tetraoxosulphate (VI) are crystalline and dissolve readily in water except calcium tetraoxosulphate (VI), CaSO4, lead (II) tetraoxosulphate (VI) and mercury (I) tetraoxosulphate (VI), Hg2SO4 which are all anhydrous salts." - "Laboratory preparation of tetraoxosulphate (VI)" - "Uses of tetraoxosulphate (VI) acid" - "1. Tetraoxosulphate (VI) acid is used in the production of fertilizers - calcium dihydrogen tetraoxophosphate (V) and ammonium tetraoxosulphate (VI)." - "2. It is used in the manufacture of pigment for paints and dyestuffs." - "3. It is used for making natural and artificial fabrics and plastics." - "361" - Chemical equations such as "CuSO4.5H2O(s) --(-5H2O)--> CuSO4(s) (blue) (white (anhydrous form))" and others involving H2SO4, H2O, HCl, HNO3, NaHSO4, Na2SO4, CO2, CaSO4.
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