Manual of qualitative analysis / by Robert Galloway.

  • Galloway, Robert.
Date:
1861
Catalogue details

Licence: Public Domain Mark

Credit: Manual of qualitative analysis / by Robert Galloway. Source: Wellcome Collection.

    84/272 (page 66)
    after the precipitation, prevents or redissolves the precipi- tate formed. 159. Arseniate of ammonia (8 NH,0, AsO,) produces, in solutions of magnesia, a white precipitate of ARSENIATE OF MAGNESIA and ammonia (2 MgO, NH,O, AsO,), which is soluble in acetic and other weak acids. 160. Phosphate of soda (2 NaO, HO, PO,;) produces, in concentrated solutions of magnesia, a precipitate of PHos- PHATE OF MAGNESIA (2 MgO, HO, PO,). A magnesian phosphate more insoluble in water may be produced by add- ing, along with the phosphate of soda, chloride of ammonium and ammonia ; the precipitate in this case being PHOSPHATE OF MAGNESIA AND AMMONIA (2 MgO, NH, O, PO;); both phosphates are soluble in free acids. of magnesia and ammonia, are the only magnesian salts which are insoluble in aqueous solutions containing salts of ammonia. 162. If magnesia or any of its compounds, after beaks ignited strongly by the blowpipe flame upon a charcoal support, be moistened with nitrate of cobalt, and again ignited, the mass assumes, on cooling, a pale flesh colour. THIRD GROUP. OxipE or Zinc. Oxipe oF MANGANESE. OXIDE OF NickEeL. OxipEz oF CoBALT. 163. The members of this group are insoluble in water ; but they dissolve readily in the dilute mineral acids, sul- phuric, nitric, and hydrochloric acids, the salts they form with these acids being soluble. They are not precipitated in the least degree from their solutions by hydrosulphuric