Chemical lecture experiments . on. — Sulphuric acid, when added to a solu-tion of barium chlorate, forms barium sulphate and chloricacid. Dilute sulphuric acid should be gradually added to a solu-tion of barium chlorate nntil the barium is completely pre-cipitated. On filtering off the liquid it will be found tocontain chloric acid and possess strong bleaching properties. Ba(C108)2 + H2S04 = BaS04 + 2 HC10S. Litmus; Ba(C103)2. PERCHLORIC ACID 39. Preparation. — Sulphuric acid reacts with pure potas-sium perchlorate, liberating perchloric acid. Five grams of chemically purepotassium perchlorate
Chemical lecture experiments . on. — Sulphuric acid, when added to a solu-tion of barium chlorate, forms barium sulphate and chloricacid. Dilute sulphuric acid should be gradually added to a solu-tion of barium chlorate nntil the barium is completely pre-cipitated. On filtering off the liquid it will be found tocontain chloric acid and possess strong bleaching properties. Ba(C108)2 + H2S04 = BaS04 + 2 HC10S. Litmus; Ba(C103)2. PERCHLORIC ACID 39. Preparation. — Sulphuric acid reacts with pure potas-sium perchlorate, liberating perchloric acid. Five grams of chemically purepotassium perchlorate are heatedgently with 12 cc. of pure concen-trated sulphuric acid in a 100 retort (Fig. 52). Thepowder is placed in the flask and theconcentrated acid poured througha funnel, the introduction of acidinto the neck of the retort beingthus avoided. The retort is thengently heated by a low flame. Ahigh temperature is as undesirable as it is unnecessary,since the perchloric acid distils at about 110°. A few drops. Fig. 52 PERCHLOKIC ACID 105 of an oily, strongly fuming distillate are obtained in thetest-tube used as a receiver. 2 KC104 + H2S04 = K2S04 + 2 cc. tubulated retort; c. p. KC104 ; c. p. con. H2S04. 40. Bleaching action. — One drop of the distillate ob-tained in the preceding experiment is allowed to fall into atest-tube containing 3 or 4 cc. of water. The diluted per-chloric acid, when added to a solution of indigo, bleaches itimmediately. Perchloric acid; indigo solution. 41. Combustion of charcoal.—Perchloric acid is a strongoxidizing agent, and when a small piece of charcoal, heatedto glowing, is dropped into a test-tube containing a fewdrops of the acid, the charcoal burns. Perchloric acid ; charcoal. 24. Action on organic matter.— A drop of perchloric acidon the end of a glass rod is spread on a piece of acid destroys the paper completely, cutting a hole in itand igniting it. By holding the paper high above the namea
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