最早,劳伦斯·约瑟夫·亨德森在研究碳酸的缓冲能力时提出亨德森方程,后来,卡尔·阿尔伯特·哈塞尔巴尔赫将亨德森方程写为对数形式,并用于研究血液中碳酸引起的代谢性酸中毒(拓展阅读:Henderson-Hasselbalch equation and the pH of buffer solution)。
pKa = -logKa Assumptions for the Henderson-Hasselbalch Equation The reason the Henderson-Hasselbalch equation is an approximation is because it takes water chemistry out of the equation. This works when water is the solvent and is present in a very large proportion to the [H+] and acid-conjug...
Having the formulas correct is the most important part, and I see that you've gotten that correct already. If you've got the Ka value and the concentration of the solution, then you've got everything you need. The Ka value is pretty much the equillibrium constant of the equation: HA ...
Ka=[A−][H+]/[HA]Ka=[A−][H+]/[HA] A similar chemical reaction between base BOH and water looks like this: BOH⇌OH−+B+BOH⇌OH−+B+ The next equation gives the base ionization constant for the above formula: Kb=[OH−][B+]/[BOH]Kb=[OH−][B+]/[BOH] If you...
Let's say we have a 0.1 M solution of acetic acid. At equilibrium, let's assume that the concentration of CH3COOis x M and the concentration of H+ is also x M. Using the equilibrium constant expression, we can write: Ka = xx/0.1。 Simplifying the equation, we get: x^2 = Ka0.1...
1. What is the pH of a buffer composed of 0.25 M lactic acid and 0.20 M lactate ion? The pKa for lactic acid is 3.86. pH = pKa + log ([A]/[HA]) 2. Use the Henderson-Hasselbalch equation to calculat An acid has a pKa of 6.0. Determine th...
ph is equal to the sum of the pka value and the log of the conjugate base concentration divided by the weak acid concentration. halfway through the equivalence point: ph = pka it is worth mentioning that this equation is occasionally written for the ka value instead of the pka value, so...
The Henderson-Hasselbalch equation solves for the pH of a solution using pKa, which is the negative log of the acid dissociation constant. This value is an equilibrium constant for the reaction of HA⇌A−+H+, which is a measure of how strong an acid HA is. If Ka is large and pKa...
Ka= [H30+] [A-]/[HA] All the reactions happen in water, so it it's usually deleted from the equation. Deriving Ka from pH The pH of an aqueous acid solution is a measure of the concentration of free hydrogen (or hydronium) ions it contains: pH = -log [H+]orpH = -log [H30+...
How to calculate pH of a solution? Learn about pH equation and how this equation can be used when finding pH of a given solution. Also, see examples. Related to this Question What is pH scale? A) what is the ph of 3.3 � 10 ? 3 M H C l ? B) What is the pH of 8 � ...