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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 …

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. known as …

Use this acids and bases chart to find the relative strength of the most common acids and bases. This acid-base chart includes the K a value for reference along with the chemical's formula and the acid’s conjugate base. The acid and base chart is a reference table designed to make determining the strength of acids and bases simpler.

To grasp the significance of Ka, it is essential to recognize that not all acids behave similarly in aqueous solutions. They can be categorized broadly into two groups based on their dissociation: Strong Acids: These acids completely dissociate in solution, showing a high value of Ka.

What is K a in Chemistry? The acid dissociation constant (Ka) is used to differentiate between strong and weak acids. The acid dissociates more as the Ka increases. Strong acids must therefore dissociate more in water. A weak acid, on the other hand, is less likely to ionise and release a hydrogen ion, leading to a less acidic solution.

2023年1月30日 · Ka, the acid ionization constant, is the equilibrium constant for chemical reactions involving weak acids in aqueous solution. The numerical value of Ka is used to predict the extent of acid dissociation.

2024年10月25日 · Learn about acid dissociation constant for your A-level chemistry exam. Find information on ka and pka, weak acids and equilibrium expressions.

Ka or dissociation constant is a standard used to measure the acidic strength. It determines the dissociation of acid in an aqueous solution. Ka is generally used in distinguishing strong acid from a weak acid. More the value of Ka higher would be its dissociation. We can use numerous parameters to determine the Ka value. Few of them are ...

2024年12月23日 · Calculating pH, Ka, pKA & Kw pH. The pH indicates the acidity or basicity of an acid or alkali. The pH scale goes from 0.0 to 14.0. Acids have a pH below 7.0. Pure water is neutral with a pH of 7.0. Bases and alkalis have a pH above 7.0. pH can be calculated using: pH = -log 10 [H +] where [H +] = concentration of H + ions (mol dm-3)