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苛性钠中的碳酸盐测定一般常用方法,采用双指示剂法,样品溶解后加酚酞指示剂用1N盐酸标准溶液滴定到接近终点记下读数,然后用0.1N盐酸标准溶液进一步滴定到粉红色消失记下读数,然后再加甲基橙指领剂并用0.1N盐酸标准溶液继续滴定到橙红色记下读数,双指示剂法因采用两个指示剂分三步滴定,测定手续繁复,结果稳定性差。现我们经过长期试验和仪器的改进采用气体法测定苛性钠中的碳酸盐,样品溶
Caustic soda in the determination of carbonate commonly used method, the use of dual indicator method, the sample dissolved phenolphthalein indicator with 1N hydrochloric acid standard solution titration to the end point down the reading, and then further titrated with 0.1N hydrochloric acid standard solution to pink Disappear Note the readings, and then add methyl orange refers to the collar reagent and 0.1N hydrochloric acid standard solution to continue titration to orange red write down the reading, double indicator method due to the use of two indicators in three steps titration, determination of complex procedures, the results were stable Poor sex. Now we have long-term test and the improvement of the instrument using gas method of caustic soda carbonate, sample solution