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二、副反应和副反应系数各类滴定方法中,既然使用某一化学反应作为滴定反应,这一反应就是主反应。事实上化学反应往往是复杂的。为什么钙和镁的络合滴定必需在碱性溶液中进行呢?那就是因为在酸性溶液中,H~+浓度大大增加,加入的EDTA大量与H~+结合(质子化)的结果硼酸是一种很弱的酸,无法用碱滴定,但在加入多羟基醇后,由于硼酸根与多羟醇的络合,使酸碱滴定这一主反应得以进行。这类例子比比皆是。我们把这种影响主反应中各反应物或生成物的浓度的其它化学反应称为副反应。
Second, side effects and side effects of various types of titration method, since the use of a chemical reaction as a titration reaction, the reaction is the main reaction. In fact, chemical reactions are often complicated. Why the complexometric titration of calcium and magnesium must be carried out in alkaline solution? That is because in acid solution, H ~ + concentration is greatly increased, a large number of added EDTA and H ~ + binding (protonation) as a result of boric acid is a A very weak acid, can not be titrated with alkali, but after the addition of polyhydric alcohol, due to the complexation of borate and polyhydric alcohol, the acid-base titration of the main reaction was carried out. Such examples abound. We refer to other chemical reactions that affect the concentration of each reactant or product in the main reaction as a side reaction.