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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Henderson-Hasselbalch equation ： ウィキペディア英語版 Henderson–Hasselbalch equation In chemistry, the Henderson–Hasselbalch equation describes the derivation of pH as a measure of acidity (using , the negative log of the acid dissociation constant) in biological and chemical systems. The equation is also useful for estimating the pH of a buffer solution and finding the equilibrium pH in acid-base reactions (it is widely used to calculate the isoelectric point of proteins). The equation is given by: :$\backslash mathrm\; =\; \backslash mathrmK\_\backslash mathrm+\; \backslash log\_\; \backslash left\; (\; \backslash frac^-">)\}">)\}\; \backslash right\; )$ Here, is the molar concentration of the undissociated weak acid, is the molar concentration (molarity, ''M'') of this acid's conjugate base and is where is the acid dissociation constant, that is: :$\backslash mathrmK\_\backslash mathrm\; =\; -\; \backslash log\_\; (K\_\backslash mathrm)\; =\; -\; \backslash log\_\; \backslash left\; (\; \backslash frac\backslash mathrm^+"\; TITLE="\backslash mathrm\_\backslash mathrm^+">)()\}">)\}\; \backslash right\; )$ for the non-specific Brønsted acid-base reaction: $\backslash mathrm\; +\; \backslash mathrm\_\backslash mathrm\; \backslash rightleftharpoons\; \backslash mathrm^-\; +\; \backslash mathrm\_\backslash mathrm^+$ In these equations, denotes the ionic form of the relevant acid. Bracketed quantities such as () and () denote the molar concentration of the quantity enclosed. ==For bases== For the standard base equation: :$\backslash mathrm\; +\; \backslash mathrm^\; \backslash rightleftharpoons\; \backslash mathrm^$ A second form of the equation, known as the Heylman Equation, expressed in terms of $K\_\backslash mathrm$ where $K\_\backslash mathrm$ is the base dissociation constant: :$\backslash mathrmK\_\backslash mathrm\; =\; -\; \backslash log\_\; (K\_\backslash mathrm)\; =\; -\; \backslash log\_\; \backslash left\; (\; \backslash frac^-"\; TITLE="\backslash mathrm\backslash mathrm^-">)()\}^-">)\}\; \backslash right\; )$ In analogy to the above equations, the following equation is valid: :$\backslash mathrm\; =\; \backslash mathrmK\_\backslash mathrm+\; \backslash log\_\; \backslash left\; (\; \backslash frac^+">)\}">)\}\; \backslash right\; )$ Where BH+ denotes the conjugate acid of the corresponding base B. Using the properties of these terms at 25 degrees Celsius one can synthesise an equation for pH of basic solutions in terms of p''K''a and pH: :$\backslash mathrm\; =\; \backslash mathrmK\_\backslash mathrm\; +\; \backslash log\_\; \backslash left(\backslash frac">)\}"\; TITLE="\backslash mathrm^">)\}\backslash right)$ 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Henderson–Hasselbalch equation」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.