An Introduction to Chemical Science by Rufus Phillips Williams
page 73 of 262 (27%)
page 73 of 262 (27%)
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?Br, ? ?Cl? ?
?I, ? ?Br? ? ?F, ? ?I? ? H3PO4, phosphoric acid. H3PO3, phosphorous acid. ?As? ? ?As? ? Complete these equations:-- H2SO3 - H2O = ? | 2 HN03 - H2O = ? H2SO4 - H2O = ? | 2 HNO2 - H2O = ? H2CO3 - H2O = ? | 2 H3AsO4 - 3 H2O = ? Are the products in each case metallic or non-metallic oxides? They are called anhydrides. Notice that each is formed by the withdrawal of water from an acid. Reverse the equations; as, SO3 + H2O = ? 68. An Anhydride is what remains after water has been removed from an acid; or, it is the oxide of a non- metallic element, which, united with water, forms an acid. SO2 is sulphurous anhydride, SO2 sulphuric anhydride, the ending ic meaning more O, or negative element, than ous. Name the others above. Anhydrides were formerly called acids,--anhydrous acids, in distinction from hydrated ones, as CO2 even now is often called carbonic acid. Experiment 40.--Hold a piece of wet blue litmus paper in the fumes of SO2, and note the acid test. Try the same with dry |
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