Join Yahoo Answers and get 100 points today. The term 'pKa' is more commonly used in chemical calculations as compared to 'Ka'. Computing pK a from K a means performing the same operation as with pH: Take the negative logarithm of K a , and there is your answer. Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals. 0 0. Ka=1*10^-pKa Same is true for, say, concentration of H+: [H+]=1*10^-pH The prefix "p" in this case is the negative log =>K_a=10^-(pK_a) pK_a=-log_10K_a =>-pK_a=log_10K_a =>10^-(pK_a)=K_a =>K_a=10^-(pK_a) For example, log(1000) = 3, because 10^3 = 1000. 4 years ago. S. STxHorn MS0. Despite this, there is a lot of confusion between the two concepts. Ka = 10^(-pKa) = 10^(-8.6) = 0.000000002. Calculating pH from pKa: The Henderson-Hasselbach Equation You can calculate the pH of a solution given the pKa of the acid and the concentrations above, that of the donated protons excluded. 4 years ago. Formula to calculate Ka from pKa. pKa is expressed as a common logarithm (base 10) and not as a natural logarithm (base e). Still have questions? It can be inferred that a higher value of Ka resemble stronger acid. 2 0. nickie. This is great. For simplicity we denote strength of an acid in term of -log[H+]. To convert the Ka value of 7.1 * 10^-7 to the pKa value with no calculator, do we just assume that the power is approximately equivalent to the pKa? 0 0. How do you calculate the pKa to Ka and vice versa in your head?? Thus a lower value of pKa (since pKa = -logKa ) which -logKa will resemble a stronger acid. So for this example we would approximate the pKa … Get your answers by asking now. The logarithm of the number in parentheses -- Ka, in this case -- is the power or exponent to which the number 10 is raised to equal that number. How to convert between Ka and pKa (or Kb and pKb) More Subjects: C++ Programming Calculus Chemistry Circuits Differential Equations Anonymous. Lv 4. According to the Chem Tutor website, this is expressed by the equation pKa = -log(Ka). Calculating a Ka Value from a Known pH Last updated; Save as PDF Page ID 1315; Definitions; References; Contributors and Attributions; The quantity pH, or "power of hydrogen," is a numerical representation of the acidity or basicity of a solution.It can be used to calculate the concentration of hydrogen ions [H +] or hydronium ions [H 3 O +] in an aqueous solution. This ScienceStruck post tells you how to convert pKa to Ka, with the help of an equation relating the two values. The dissociation constant for a strong acid can be as high as 10^7 while for a weak acid it can be as low as 10^-12. I often spend my half an hour to read this blog's posts daily along with a mug of coffee. The ionization of an acid in water measures the relative strength of the acid. Any shortcuts/simple steps? Ka is the acid dissociation constant while Kpa is simply the negative logarithm of Ka. Ask Question + 100. Nov 9, 2011 155 0 Texas Status Pre-Medical Apr 11, 2012 #2 Melomare17 said: How do you calculate the pKa to Ka and vice versa in your head?? Any shortcuts/simple steps? Write down the relationship between pKa and Ka.
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