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一方法要点吸取一定体积的氯化铵硬化液,以酚酞作指示剂,用碱标液滴至红色终点.据所耗碱标液毫升数,计算盐酸含量。继加甲醛,以碱滴定其酸价,换算成氯化铵的含量。另取一定体积的氯化铵硬化液,以铬酸钾为指示剂,用硝酸银标液滴定至氯化银沉淀略带淡红色为终点。用硝酸银标液耗量,计算氯根总量,减掉盐酸中氯根和氯化铵中氯根量,即得氯化钠中氯根含量,再换算成氯化钠含量. 二试剂中性甲醛:1+1(在1+1的甲醛溶液中,加2滴酚酞,以0.1N氢氧化钠溶液滴定呈微红色); 酚酞:1%乙醇溶液. 三操作
A method to draw a certain point of ammonium chloride hardened solution to phenolphthalein as an indicator, with the standard drop to the red end of the base.According to consumption of standard solution milliliter, calculate the hydrochloric acid content. Following the addition of formaldehyde, titration of its acid base, converted into ammonium chloride content. Another take a certain volume of ammonium chloride hardening solution, potassium chromate as an indicator, titration with silver nitrate titration to silver chloride precipitation slightly reddish end. With silver nitrate solution consumption, calculate the total amount of chloride, chloride and chloride in hydrochloric acid chloride in the amount of chloride, chloride content of sodium chloride, and then converted into sodium chloride content of two reagents Formaldehyde: 1 + 1 (2 drops of phenolphthalein in 1 + 1 formaldehyde solution, reddish with 0.1N sodium hydroxide solution); phenolphthalein: 1% ethanol solution.