
7.12: Relationship between Ka, Kb, pKa, and pKb
2021年4月28日 · There is a simple relationship between the magnitude of Ka for an acid and Kb for its conjugate base. Consider, for example, the ionization of hydrocyanic acid (HCN) in water to produce an acidic solution, and the reaction of with water to produce a basic solution: HCN (aq) ⇌ H + (aq) + CN − (aq) CN − (aq) + H2O (l) ⇌ OH − (aq) + HCN (aq)
酸碱理论&Ka、Kb、pKa、pKb - 360doc
2023年7月12日 · 对于一对共轭酸碱对而言,通过公式推导可知pKa+pKb=pKw=14(25℃)。 例如当NH3做碱时 pKb为4.75,生成共轭酸NH4+,NH4+的pKa为9.25,两者之和为14。 但人们有时依然习惯用pKa表示碱性的强弱,此处的pKa并不代表碱的pKa,而是指其共轭酸的pKa,共轭酸的pKa越大,则碱的pKb越小,碱的碱性越强。 当然对于有些分子即可做酸,也可做碱,例如苯胺做酸时会电离产生H+,其pKa=28,此时的pKa指其作为酸的pKa。 当苯胺做碱时, …
pH, pKa, Ka, pKb, and Kb in Chemistry - Science Notes and …
2020年4月15日 · pH, pKa, pKb, Ka, and Kb are used in chemistry to describe how acidic or basic a solution is and to gauge the strength of acids and bases. The pH scale is the most familiar measure of acidity and basicity, but pKa, pKb, Ka, and Kb are better for predicting acid and base strength and their reactions.
pka+pkb等于多少 - 百家号
2024年2月11日 · 在讨论pKa和pKb的关系之前,我们首先需要理解这两个概念的定义以及它们在化学中的应用。 pKa和pKb是描述酸碱反应中酸碱离解常数的负对数,是化学中非常重要的参数。
A Guide to Acid-Base Equilibrium Constants - ThoughtCo
2024年5月25日 · Ka, pKa, Kb, and pKb are most helpful when predicting whether a species will donate or accept protons at a specific pH value. They describe the degree of ionization of an acid or base and are true indicators of acid or base strength because adding water to a solution will not change the equilibrium constant.
pKa to pKb Conversion Table - AAT Bioquest
pK a and pK b provide logarithmic representations of their counterparts for acid and base strengths (K a and K b), and allow for a more straightforward comparison of the relative strengths of acids and bases: smaller pK a values indicate stronger acids, while smaller pK b values indicate stronger bases. pK a and pK b are also useful in predictin...
Ka,Kb,PKa,PKb分别是什么意思? - 百度知道
Ka,Kb,PKa,PKb分别是什么意思?1、Ka:表示弱酸的电离常数,条件是在室温下(25°C)。2、Kb:弱碱的电离常数。电离平衡常数只与温度有关,温度升高,K值增大。电离常数反映了弱电解质的电离程度的大小,K值越大,电
PKA和PKB之间的差异|比较类似术语之间的差异
关键区别 - PKA与PKB. PKA和PKB是化学中的常见术语,称为解离常数。PKA是酸解离常数,PKB是b一个se dissociation constant。这些术语用于使其易于使用非常大或非常小的值工作。这些术语中的“ P”代表“负对数”。这关键区别在PKA和PKB之间PKA是KA的负对数,而PKB是Kb的负 ...
Ka, pKa, Kb, and pKb Relationship - Chemistry Steps
We have the concentration of ammonia and the ammonium ion, so the only missing part is the pKa. Remember, Ka is the dissociation constant of the acid or the conjugate acid, while Kb is the dissociation constant of the base. So, for these components, the corresponding dissociation equation would be:
酸碱中的PH值,Ka,pKa,Kb,pKb是什么?他们是什么关系-材料研发 …
酸的解离常数Ka=[A-][H+]/[HA],由于Ka数值经常为10的n次方,运用时不方便,就诞生了pKa,pKa=-lgKa。 酸的定义为酸电离50%时的pH,此时酸与其共轭碱浓度相同,即[HA]=[A-],则解离常数Ka=[A-][H+]/[HA]=[H+],因此pKa=-lgKa=-lg[H+]=pH。