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研究了双组分混合弱酸溶液〔Ｈ＋〕近似计算时忽略水离解的条件和平方加和法则的适用性。当较强酸的浓度（Ｃ１）满足Ｃ１≥ｂＫａ１（ｂ值范围０５～８，与Ｃ１／Ｃ２、Ｋａ１／Ｋａ２等值有关）时，使用平方加和法则计算〔Ｈ＋〕的误差较小（｜ＲＥ｜≤±２３％）。
The applicability of neglecting the conditions of water dissociation and the square addition rule for the approximate calculation of [H +] in a two-component mixed weak acid solution was studied. When the stronger acid concentration (C1) satisfies C1 ≥ bKa1 (b value range is 0.5-5, which is related to C1 / C2, Ka1 / Ka2, etc.), the error of using the square addition law to calculate [H +] is small | RE | ≤ ± 2.3%).