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一、目的:测定酚酞的电离平衡常数。二、原理:酚酞可以看成是一种弱酸,以HR表示,在水溶液中按下式电离。已知定温下,上反应平衡后,若改变体系中的H°浓度,将使平衡移动;新的平衡达到时,各参与物的浓度均有所变化。但平衡常数不变!本实验将以不同pH的缓冲液为反应介质,在定温下测定酚酞之电离平衡常数,以加深平衡
First, the purpose: determination of phenolphthalein ionization equilibrium constant. Second, the principle: Phenolphthalein can be seen as a weak acid, HR said, according to the following formula in aqueous solution ionization. It is known that at constant temperature, after the above reaction is balanced, if the H ° concentration in the system is changed, the equilibrium will be shifted; when the new equilibrium is reached, the concentration of each participant will be changed. But the same constant constant! In this experiment, different pH buffer solution as the reaction medium, at room temperature phenolphthalein ionization equilibrium constant determination to deepen the balance