对于氢卤酸和ⅥA族元素某些氢化物在水溶液中的酸强度的变化规律问题,已有很多论述。为了揭示酸强度的递变规律,在教学中常常引用元素电负性、分子的偶极矩等数据来推断分子的极性大小,由此会得出与实测酸强度变化规律相反的结论。因而又从键能(或键矩)、原子的半径等方面来分析其差异。这种用适用于共价气态分子状态的概念来处理水溶液中的质点,是不够确切的,因忽略了所讨 There have been many discussions on the change law of the acid strength of certain hydrides of hydrohalic acid and VIA elements in aqueous solution. In order to reveal the law of the gradual change of the acid strength, in the teaching often quotes the data such as the electron negative element, the molecule’s dipole moment, etc. to infer the polarity of the molecule, which leads to the conclusion that is contrary to the change rule of the measured acid intensity. Therefore, the difference between the key energy (or bond moment) and the radius of the atom is analyzed. This treatment of particles in aqueous solutions using the concept applicable to the state of covalent gaseous molecules is inexact because it ignores the