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Weigh about 150 mg ¡À 10% of the substance under test, transfer to a 150 ml beaker and dissolve in 30 ml methanol and 40 ml water ¨C the fine precipitate is formed. Titrate potentiometrically with standardized 0.1N sodium hydroxide without a combined glass-reference electrode to 90 % theoretical consumption 0.1 N sodium hydroxide. Titration is completed by inserting a glass-reference electrode ¨C continue titration to inflection point. Ï»®Ïß¾äʲôÒâ˼£¿ÄѵÀ²»ÊÇÖ±½Ó×Ô¶¯µÎ¶¨Âð |
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