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今有0.10mol·L－1HX弱酸溶液，其电离度为2.0%，试计算弱酸电离常数Ka= ；若该酸浓度为0.20mol·L－1，试计算其电离度α= ；若该酸的电离度为1.0%，试计算其浓度C= 。

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取0.1mol·L－1某一元弱酸溶液50mL与 20mL0.1mol· L－1KOH溶液混合，将混合溶液稀释到100mL，测此溶液pH值为5.25，此一元弱酸的电离常数K= 。

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