ホウフッ化カリウムの中和滴定
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概要
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A rapid method for the determination of potassium borofluoride, which involves the decomposition of potassium borofluoride using calcium chloride solution with the formation of slightly soluble calcium fluoride and which involves too the subsequent titration of liberated acid with a sodium hydroxide solution using methyl orange as indicator, is presented here. The conditions for the complete decomposition of potassium borofluoride are: (1) initial concentration of acid; 0.02N HCl, (2) concentration of calcium chloride; 1M, (3) total volume of aqueous solution; 100ml, (4) time of boiling; 5 minutes. The amount of hydrochloric acid previously added is subtracted from titration, thus less than about 250mg sample can be determined. When more than 250mg sample is treated, the decomposition is incomplete because the concentration of the liberated acid exceeds the suitable range for 15 the decomposition. Then, after the first decomposition and titration, the conditions are adjusted again and the second decomposition and titration is continued, thus more than 1000mg sample can be determined.
- 信州大学教養部の論文
- 1968-01-31
信州大学教養部 | 論文
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