It can be inferred that a higher value of Ka resemble stronger acid. Formula to calculate Ka from pKa. Ka = 10^(-pKa) = 10^(-8.6) = 0.000000002. 4 years ago. 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. I often spend my half an hour to read this blog's posts daily along with a mug of coffee. Ka is the acid dissociation constant while Kpa is simply the negative logarithm of Ka. This ScienceStruck post tells you how to convert pKa to Ka, with the help of an equation relating the two values. 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. Ask Question + 100. 4 years ago. Join Yahoo Answers and get 100 points today. =>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) 0 0. The term 'pKa' is more commonly used in chemical calculations as compared to 'Ka'. 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. 2 0. nickie. Anonymous. The ionization of an acid in water measures the relative strength of the acid. 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. S. STxHorn MS0. So for this example we would approximate the pKa … pKa is expressed as a common logarithm (base 10) and not as a natural logarithm (base e). Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals. Despite this, there is a lot of confusion between the two concepts. Lv 4. 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. Still have questions? 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? How do you calculate the pKa to Ka and vice versa in your head?? Write down the relationship between pKa and Ka. Get your answers by asking now. 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 Any shortcuts/simple steps? Any shortcuts/simple steps? For simplicity we denote strength of an acid in term of -log[H+]. How to convert between Ka and pKa (or Kb and pKb) More Subjects: C++ Programming Calculus Chemistry Circuits Differential Equations 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?? 0 0. Thus a lower value of pKa (since pKa = -logKa ) which -logKa will resemble a stronger acid. For example, log(1000) = 3, because 10^3 = 1000. This is great. According to the Chem Tutor website, this is expressed by the equation pKa = -log(Ka).
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