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在络合滴定中有人称最高允许酸度至最低酸度为适宜酸度范围,并认为在此范围内滴定均可获得准确结果。然而对于一个确定的滴定体系,在一个酸度范围之内△P_M 不是常数,因此在所渭的“适宜酸度范围”内滴定的准确度并非都能符合要求,有时甚至误差很大。欲求可满足指定误差要求的酸度范围(即所谓“最佳酸度范围”)可采用列表作图法。为此需在所用指示剂的可用范围之内计算各 pH 下的终点误差后,绘出 TE-pH 图方可求
In the complexation titration in the highest allowable acidity to the lowest acidity is the appropriate acidity range, and that in this range titration can get accurate results. However, for a given titration system, ΔP_M is not a constant within a range of acidity. Therefore, not all of the accuracies of titration within the “reasonable range of acidity” are acceptable and sometimes even very large. Desire to meet the specified error requirements acidity range (the so-called “best acidity range”) can be used list mapping method. To do this, calculate the endpoint error at each pH within the available range of indicators used, then plot the TE-pH plot