Qualitative analysis / by William Briggs and R.W. Stewart.

  • William Briggs
Date:
1913
Catalogue details

Licence: Public Domain Mark

Credit: Qualitative analysis / by William Briggs and R.W. Stewart. Source: Wellcome Collection.

    154/180 (page 138)
    are soluble in water; the latter, especially that of calcium, are not readily soluble. These aqueous solutions have an alkaline reaction. Boil with dilute sulphuric acid. With the oxides solution takes place without the evolution of gas, except that certain metallic oxides with a high percentage of oxygen such as Mn02, Cr03, etc. (and salts of these), may give off oxygen. Some oxides e.g., Si02, Sn02, are insoluble, whilst others, such as A1203, Fe203, Mn304, when in the mineral condition, or if they have been ignited, dissolve slowly and with difficulty. The sulphides, in presence of dilute sulphuric acid, dissolve with the evolution of H2S. (Test as described at page 58.) The following sulphides resist the action of the acid :— CuS, Bi2S8, HgS, Ag2S ; whilst PbS is converted into the white insoluble PbS04. The Detection of a Salt. The salts which are referred to in the following treatment are :—nitrates, nitrites, chlorates, carbonates, sulphates, sulphites, phosphates, arsenates, silicates, chromates, chlor¬ ides, bromides, iodides, and fluorides. L. By inspection and in presence of water. The salts are usually crystalline in character, and may be divided into two classes :— (a) Those soluble in water. (b) Those insoluble or almost insoluble in water. Soluble in water :—Nitrates of all the metals; chlorates of all the elements; the chlorides, bromides, and iodides of all the elements, except Ag, Pb, and Hg (ous); all salts of the alkali metals; and the sulphates except those of Pb, Ba, Sr, Ca. Insoluble in water :—The commonly occurring carbonates, phosphates, sulphites, arsenates, silicates, and chromates, except those of the alkali metals; the chlorides, bromides,