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在莫尔法中,实验证明了K_2CrO_4指示剂的用量为5×10~(-3)mol·L~(-1)左右。但全观各种版本的《分析化学》,对K_2CrO_4指示剂的用量,从理论上都没能给出与实验值趋于一致的结果。本文从K_2CrO_4指示剂在滴定终点时存在的各种型体与溶液PH值的关系出发,结合滴定分析法的方法误差,从理论上得出了K_2CrO_4指示剂用量的理论值与实验值趋于一致的结果,使理论与实践统一起来。并对K_2CrO_4指示剂用量与溶液PH值之间的关系,作了定量描述。这无疑进一步完善了莫尔法理论。
In the Mohr method, experiments show that the dosage of K 2 CrO 4 indicator is about 5 × 10 -3 mol·L -1. However, all kinds of “analytical chemistry”, the amount of K_2CrO_4 indicator, in theory failed to give consistent with the experimental results. In this paper, starting from the relationship between K_2CrO_4 indicator and the pH value of the solution at the end of titration, the theoretical value of K_2CrO_4 indicator is in agreement with the experimental value by combining with the error of titration method The result, the theory and practice together. The relationship between the amount of K_2CrO_4 indicator and the pH value of the solution was also described quantitatively. This will undoubtedly further improve the theory of Moore.