In chemistry, an acid dissociation constant (also known as acidity constant, or acid-ionization constant; denoted ⁠ ⁠) is a quantitative measure of the strength of an acid in solution. It is the equilibrium constant for a chemical reaction

酸度系數 （英語： Acid dissociation constant，又名 酸解離常数，代號 Ka 、 pKa 、 pKa值），在 化學 及 生物化學 中，是指一個特定的 平衡常數，以代表一種 酸 解離 氫 離子 的能力。 該平衡狀況是指由一種酸（HA）中，將 氫離子 （即 質子）轉移至 水 （H 2 O）。 水的濃度 [H 2 O]是不會在系數中顯示的。 一种酸的p Ka 越大则酸性越弱，p Ka 越小则酸性越强（反過來說， Ka 值越大，解離度高，酸性越強， Ka 值越小，部份解離，酸性越弱）。 p Ka <0的酸在水中 …

2021年10月5日 · pKa in chemistry relates to the acid dissociation constant Ka as well as to pH and the strength of acids. Here is the pKa definition, its relationship with Ka and pH, and how pKa indicates whether an acid is strong or weak .

2024年2月18日 · pKa 是 酸式解离常数 （Ka）的负对数。 数值越小，酸性越强，提供质子的能力也越强，是描述酸或碱的强弱的指标。 有酸式电离平衡常数（Ka），自然也有 碱式电离平衡常数 （Kb），并且两者的乘积为 水的电离平衡常数 （Kw）。 Ka数值范围过宽，为了方便计算，便使用其负对数表示。 pKa在本质上表明为了让化合物捐献或接受质子，pH需要达到什么程度。 pH取决于溶液的浓度，这意味着弱酸实际上可以比稀强酸有更低的pH值；pKa则不受浓度影响，只 …

2017年10月27日 · pKa is an acid dissociation constant used to describe the acidity of a particular molecule. Its value is directly related to the structure of the given compound.

The relative acidity of different compounds or functional groups – in other words, their relative capacity to donate a proton to a common base under identical conditions – is quantified by a number called the acid dissociation constant, abbreviated K a. The common base chosen for comparison is water.

The pKa measures how tightly a proton is held by a Bronsted acid. A pKa may be a small, negative number, such as -3 or -5. It may be a larger, positive number, such as 30 or 50.

pKa is a number that describes the acidity of a particular molecule. It measures the strength of an acid by how tightly a proton is held by a Bronsted acid. The lower the value of pKa, the stronger the acid and the greater its ability to donate its protons. describe the acidity of …

2024年8月30日 · pKa is the negative base 10 logarithm of Ka (acid dissociation constant) of a solution. The following are some important applications of pH and pKa; pKa is very helpful in drug development. For example, pKa influences the solubility, oral absorption, distribution, and pharmacokinetics of a drug. pH play an important role in human digestive system.

The pK a of a given acid, or the conjugate acid of the base, is constant and therefore, the only variable in the equation is the logarithm term which depends on the acid-base pair concentrations. One application of this relationship is the possibility to predict whether the pH of the solution is going to be equal to or different than the p K a ...