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在纯水或水溶液中均存在H_2O(?)H~+_+OH~-,在25℃时纯水中c(H`+)=c(OH`-)=1×10~(-7)mol/L,c(H~+)·c(OH~-)=1×10~(-14)=K_w,K_w不仅适用于纯水,也适用于酸、碱、盐的水溶液。水的电离平衡符合平衡移动原理,不仅受温度的影响,还受酸、碱、盐等的影响,条件改变可能促进水的电离,也可能抑制水的电离。由于水的电离较弱,有时水的电离可以忽略,而只考
H ~ + _ + OH ~ - exists in pure water or aqueous solution, and c (H `+) = c (OH` -) = 1 × 10-7 in pure water at 25 ℃. mol / L, c (H ~ +) · c (OH ~ -) = 1 × 10 ~ (-14) = K_w, K_w is not only suitable for pure water but also for acid, alkali and salt solution. Ionization of water in line with the principle of balanced movement, not only by the temperature, but also by the acid, alkali, salt, etc., may change the conditions to promote ionization of water, but also may inhibit water ionization. Due to the weak ionization of water, sometimes the ionization of water can be ignored, and only test