Base dissociation index

Japanese: 塩基解離指数 - えんきかいりしすう

... K _a is the acid dissociation constant, and p K _a is called the acid dissociation exponent, as -log K _a = p K _a , which expresses acidity. K _b is the base dissociation constant, and p K _b is the base dissociation exponent (which expresses basicity), but since K _b has an inverse relationship with K _a , the strength of an acid or base can be expressed by K _a or p K _a alone. In other words, the higher the value of p K _a , the weaker the acidity (stronger the basicity), and the smaller the value of p K a, the stronger the acidity (weaker the basicity). ...

From 【pK】

…There are many types of chemical equilibrium, including (1) dissociation of acids, (2) dissociation of bases, (3) formation of complex compounds, (4) formation of precipitates and other compounds, and (5) decomposition reactions such as hydrolysis. For these constants, K is distinguished by a subscript, such as the acid dissociation constant K _a (acid dissociation exponent p K _a ) for (1), the base dissociation constant K _b (base dissociation exponent p K _b ) for (2), the solubility product K sp (p K sp) for (4), and K _h (p K _h ) for (5). [Takayuki Hashiya]. …

*Some of the terminology explanations that mention "base dissociation index" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…K_aを酸解離定数，－logK_a＝pK_aのようにしてpK_aを酸解離指数といい，これによって酸性度をあらわす。K_bは塩基解離定数，pK_bは塩基解離指数(塩基性度をあらわす)であるが，K_bはK_aと逆の関係にあるからK_aあるいはpK_aだけで，酸および塩基の強さをあらわすことができる。すなわちpK_aの値が大きいほど酸性度は弱く(塩基性度は強く)，小さいほど酸性度は強い(塩基性度は弱い)。…

【pK】より

…化学平衡は，(1)酸の解離，(2)塩基の解離，(3)錯化合物生成，(4)沈殿生成，その他化合物の生成，(5)加水分解などの分解反応など，多種多様である。それらのKは，(1)に関しては酸解離定数K_a(酸解離指数pK_a)，(2)は塩基解離定数K_b(塩基解離指数pK_b)，(4)は溶解度積Ksp(pKsp)，(5)に関してはK_h(pK_h)などのように下つき文字を付しておのおのの定数を区別し，表現に便宜をはかったりする。【橋谷卓成】。…