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.

    72/180 (page 56)
    CHAPTER III. REACTIONS OF THE ACIDS. SULPHURIC ACID, H2S04. Solution—Potassium Sulphate, K2S04. 1. Barium chloride, BaCl2, gives a heavy white 'powdery precipitate of barium sulphate, BaS04, insoluble in HC1. (See p. 48.) 2. Lead acetate, Pb(C2H802)2, gives a heavy white pre¬ cipitate of lead sulphate, PbS04. (See p. 19.) SULPHUROUS ACID, H2S03. Solution—Sodium Sulphite, Na2S03. 1. Add HC1, and, if necessary, heat: the smell of burning sulphur is perceptible, S02 being evolved without the precipitation of sulphur. [Distinctionfrom thiosulphates.] Na2S03 + 2 HC1 = 2 NaCl + H20 + S02. 2. To some pieces of granulated zinc in a test-tube add a little hydrochloric acid till a brisk effervescence takes place; then pour in some of the liquid to be tested, and hold a piece of filter-paper moistened with lead acetate in the escaping gas. Any sulphite present will be reduced by the hydrogen and converted into sulphuretted