. Essentials of medical and clinical chemistry. With laboratory exercises . mixture of sulphur and manganese dioxide in the flask in the rear; (c)steam from the other flask, and (d) air or oxygen through the open tubes. 65To make H2S04 in small test-tubes, (a) Boil a little powdered sulphurand strong HN08; (£) carefully heat a pinch of sulphur with a few crystals ofKC10;H till it ignites; test for H2S04 by means of BaCl2 solution. 66 Take a reagent bottle of strong H2S04 and note its appearance, weight,taste, etc. 67 To about 5 Cc. of it in a test-tube add an equal bulk of water and noteheat p
. Essentials of medical and clinical chemistry. With laboratory exercises . mixture of sulphur and manganese dioxide in the flask in the rear; (c)steam from the other flask, and (d) air or oxygen through the open tubes. 65To make H2S04 in small test-tubes, (a) Boil a little powdered sulphurand strong HN08; (£) carefully heat a pinch of sulphur with a few crystals ofKC10;H till it ignites; test for H2S04 by means of BaCl2 solution. 66 Take a reagent bottle of strong H2S04 and note its appearance, weight,taste, etc. 67 To about 5 Cc. of it in a test-tube add an equal bulk of water and noteheat produced. 6S Moisten a bit of match, paper, cloth or other organic substance, with theacid and note that it is charred, even the dilute acid doing so if it is warmed;and for this reason be careful not to spill any on the table or your clothes. PART I. INORGANIC CHEMISTRY. Si Tests.— (i) The concentrated acid, if placed on a piece ofpaper or other organic material, will char If dilute, it willchar the paper only after being warmed and concentrated by the Fig. evaporation of its water. (2) Sulphuric acid, or any other sul-phate, will form with a solution of a barium salt a white precipi-tate (BaS04) insoluble in nitric or hydrochloric Uses.—So important in the arts that the commercial prosperityof a country may be measured by the amount of con-sumed. Properly diluted, it is a refrigerant tonic, but concentrated it is a severe caustic. 69 Pour some strong H.,S04 on an equal quantity of sugar or strong syrup;note that a mass of charcoal is formed. 10 To 5 Cc. of water in a test-tube add a few drops of some sulphate andthen a few drops of BaCl2. Note white precipitate. Agitate and pour halfinto another tube. Add HC1 to the 6rst tube and HN03 to second, and notethat the precipitate (BaS04) is not dissolved. 52 ESSENTIALS OF CHEMISTRY. IV. Nitrogen Group. Nitrogen, N 14 Phosphorus, P 31 Arsenic, As 75 Antimony (Stibium), Sb 120 Bismuth, . Bi 208 Trivalen
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