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How to calculate pKa/pKb and Ka/Kb using the 1/2 equivalent point
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Topic: How to calculate pKa/pKb and Ka/Kb using the 1/2 equivalent point (Read 7969 times)
LinzMeaux
Labrat
Posts: 2
How to calculate pKa/pKb and Ka/Kb using the 1/2 equivalent point
«
on:
October 01, 2007, 10:28:30 PM »
Using the half equivalent point, determine the pKa and the Ka for the acids. Compare the calculated values to the theoretical values recorded in your textbook. Calculate % error.
HCl titrated with NaOH 1/2 equiv about 13.5 mL, pH = 1.35
HC2H3O2 titrated with NaOH 1/2 equiv about 13 mL, pH = 4.56
Also have to do it for the bases: pKb and Kb
NH3 titrated with HCl 1/2 equiv about 11 mL, pH = 9.24
NH3 titrated with HC2H3O2 1/2 equiv about 12 mL, pH = 9.4
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maddy
Jr. Member
Posts: 64
Re: How to calculate pKa/pKb and Ka/Kb using the 1/2 equivalent point
«
Reply #1 on:
October 02, 2007, 07:44:00 AM »
Write out the value for Ka; Ka = [products]/[reactants]
You'll need to find the concentrations for your acids and bases.
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Chemistry Tutor
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Posts: 1260
Re: How to calculate pKa/pKb and Ka/Kb using the 1/2 equivalent point
«
Reply #2 on:
October 02, 2007, 02:20:42 PM »
halfway between the start of the titration and the equivalene point is the 1/2 equivalence point.
at this point the pH will be equal to the pka
the Ka = 10
-pka
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LinzMeaux
Labrat
Posts: 2
Re: How to calculate pKa/pKb and Ka/Kb using the 1/2 equivalent point
«
Reply #3 on:
October 03, 2007, 09:03:57 PM »
THANK YOU! That actually makes perfect sense. For some reason I expected it to be harder than it was. Silly me!
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