. American journal of pharmacy. of chlorine: i Cc. N/ioNaoSoOg = Gm. CI. When a liquid is to be an-alyzed, the manganese dioxideis simply added to the samplein the flask. If the chlorine in fluoridesis to be determined the pro-cedure is carried out in thesame way as for the other samples. Some HF will be evolved, but it has no effect upon thefinal results and its action upon the glass is negligible. If the sulphuric acid is free from nitric and hydrochloric acids,chlorides, nitrates and nitrous fumes, and the manganese dioxide con-tains no impurities capable of decomposing KI on volat
. American journal of pharmacy. of chlorine: i Cc. N/ioNaoSoOg = Gm. CI. When a liquid is to be an-alyzed, the manganese dioxideis simply added to the samplein the flask. If the chlorine in fluoridesis to be determined the pro-cedure is carried out in thesame way as for the other samples. Some HF will be evolved, but it has no effect upon thefinal results and its action upon the glass is negligible. If the sulphuric acid is free from nitric and hydrochloric acids,chlorides, nitrates and nitrous fumes, and the manganese dioxide con-tains no impurities capable of decomposing KI on volatilization, theboiling of the sulphuric acid and MnO. for over 8 or 10 minutes doesnot produce any appreciable coloration in the KI solution. The sul-phuric acid may be heated to fuming to drive of , otherwise ablank test can be run and appropriate correction made. The highestblank consumption of N/iO NaoSoOg did not run over Cc. in theauthors experience and this was due to nitric acid found in the sul-phuric acid Apparatus for the Determination of Chlorine in Chlorides by Distillation. 58o Pharmacopoeial Standard for i Am. Jour. Pharm.•- December, 1917. Table I. Results by Silver Chloride and by Authors Basis of i Cc. NajSOa = Gm. CI. Material Analyzed. Per Cent. Chlorine. Calc. By AgCl. By Ij. Sodium chloride (NaCl) Potassium chloride (KCl) cell mixes . . Chloride liquors (containing Mn, Zn, NH4and Ca) Rare earth fluorides Manganese ores 47-56 47-52 5-78 5-40 17-75 o 10 47-491 47 49 47-49 47-51 47-54 41-59 5-74 5-49 17-65 Av. -Av. In Table I are tabulated the results of some determinations ofchlorine in chlorides and products containing chlorides by the abovemethod. If values in Table I for sodium chloride, which, by precipi-tation, gave per ce
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