This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ...which is analogous to ammonia, NH3. It is formed by the action of nascent hydrogen on compounds of arsenic. When we have a.compound of arsenic in the presence of zinc and an acid, arsine is formed. If the compound is ordinary arsenic trioxide, AsO(r) this is reduced by nascent hydrogen as follows: --As2Os + 6 H2 = 3 ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ...which is analogous to ammonia, NH3. It is formed by the action of nascent hydrogen on compounds of arsenic. When we have a.compound of arsenic in the presence of zinc and an acid, arsine is formed. If the compound is ordinary arsenic trioxide, AsO(r) this is reduced by nascent hydrogen as follows: --As2Os + 6 H2 = 3 H20-f 2 AsH3. When arsine is heated, it is broken down into its elements, arsenic and hydrogen. When arsine is burned and a cold object introduced into the flame, arsenic is deposited upon the object. These reactions are made use of for the detection of arsenic. Marsh's method for detecting arsenic consists in reducing the arsenic compound to arsine and burning the arsine. COMPOUNDS OF ARSENIC WITH OXYGEN AND HYDROGEN Compounds of Arsenic with Oxygen.--Arsenic forms two compounds with oxygen. One of these has the composition AS2O3, and is known as arsenic trioxide; the other has the composition As205, and is known as arsenic pentoxide. Arsenic Trioxide, As203, is formed when arsenic is oxidized either by burning in the air, or by some strong oxidizing agent such as nitric acid. Arsenic Pentoxide, As205.--Arsenic pentoxide cannot be formed like phosphorus pentoxide by burning the element in oxygen. It is prepared by removing water from arsenic acid, and is, therefore, the anhydride of this acid. Arsenious Acid, H3As03.--This acid is not known in the free condition. There are, however, three classes of salts known, depending upon whether one, two, or three of the hydrogen ions have given their electrical charges to the metal atoms which have entered the compound in their stead. Arsenic Acid, H As04.--When ordinary white arsenic, or arsenic trioxide, is heated with some strong oxidizing agent such as nitric acid, or aqua regia, in the presence of.
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