Converting From pKa to Ka In some tables, you may find the pKa value listed, but you may need the Ka value to plug into your equations. The mathematical operation you perform is Ka = antilog (-pKa). You solve this by raising both sides of the original relationship to powers of 10 to...
pH Scale:pKa and Ka Cite This Article MLA Pesacreta, Mara. "How To Calculate Kb From Ka"sciencing.com, https://www.sciencing.com/calculate-kb-ka-8179437/. 13 March 2018. APA Pesacreta, Mara. (2018, March 13). How To Calculate Kb From Ka.sciencing.com. Retrieved from https://www....
If Ka is large and pKa is small, the substance is more willing to get rid of its hydrogen ion. So, to solve for a specific buffer's pH, one must know the pKa of the buffer's species, which can usually be found in tables. The next part, {eq}log\frac{ [Base] }{ [Acid] }...
Decide on the pH for your buffer. This pH should be within one pH unit from the pKa of the acid/conjugate base. So, you can prepare a buffer at pH 2 or pH 7, for example, but pH 9 would be pushing it. Use theHenderson-Hasselbachequation to calculate how much acid and base you ...
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A weak acid, HA, has a pKaof 4.756. If the solution pH is 3.85, what percentage of the acid is dissociated? First, convert pKato Kaand pH to [H+]: Ka= 10-4.756= 1.754 x 10-5 [H+] = 10-3.85= 1.413 x 10-4 Now use the equation Ka= ([H+] [A¯]) ÷ [HA], with ...