酸量法所用当量溶液的标定,以无水碳酸钠为基准物有悠久的历史。所用基准物虽不断进行研究,但迄今尚未定论。诸家的工作,多侧重于基准物的制备、提纯和干燥,而忽视了实际滴定条件和指示剂的选择。本文以无水碳酸钠标定0.1N酸溶液,使用12种单一指示剂和7种混合指示剂,且分别在按室温下直接滴定;近终点加热一步驱除二氧化碳冷后滴定;连续热驱滴定和加稍 Acid calibration method used in the equivalent solution to anhydrous sodium carbonate as the benchmark has a long history. Although the benchmark used by the ongoing research, but so far not conclusive. The work of various families focuses more on the preparation, purification and drying of reference materials, while neglecting the actual selection of titration conditions and indicators. In this paper, anhydrous sodium carbonate 0.1N acid solution calibration, the use of 12 single indicator and 7 mixed indicator, respectively, at room temperature, direct titration; near the end of the heating one step to remove carbon dioxide after the cold titration; a little