Key Difference - pKa vs pKb What is pKa?
Then the relationship between pKa and pKb is given as, (at 25oC) pKa + pKb = 14 What is the Difference Between pKa and pKb? pKa vs pKb pKa is the negative logarithm of Ka pKb is the negative logarithm of Kb Nature pKa is given for acids pKb is given for bases Relationship With Dissociation Constant pKa is related to acid dissociation constant
pKa and pKb - Yola
a) What is the pKb of its conjugate base? b) Write the equilibrium equation for this base and its Kb expression a) pKa + pKb = 14 pKb = 14 – 4 74 pKb = 9 26 b) C 2 H 3 O 2-1 + H 2O ↔ HC 2 H 3 O 2 + OH-1 Kb = [HC 2 H 3 O 2] x [OH-1]/[ C 2 H 3 O 2-1] eg) para- aminobenzoic acid, PABA, is a powerful sunscreening agent whose salts are used
substituent effects summary
pKa + pKb = 14 Organic Chemistry II Summary of Substitutent Effects Base-Catalyzed Hydrolysis of Benzoate Esters Substituents on the benzene ring can stabilize or
Table of Acids with Ka and pKa Values* CLAS
Water H2O OH-1 0 x 10-14 14 0 Group I metal hydroxides (LiOH, NaOH, etc ) Group II metal hydroxides (Mg(OH)2, Ba(OH)2, etc ) Strong bases completely dissociate in aq solution (Kb > 1, pKb < 1) Conjugate acids (cations) of strong bases are ineffective bases * Compiled from Appendix 5 Chem 1A, B, C Lab Manual and Zumdahl 6th Ed The pKa values
Organic Chemistry Lecture Outline Acids & Bases
Ka X Kb = 1 X 10-14 pKa + pKb = 14 So if either the pKa (or Ka) or pKb (or Kb) is known, then the other can be calculated H-A + H 2 O A- + H 3 O
pKa Values INDEX - Organic Chemistry Data
pKa Data Compiled by R Williams pKa Values INDEX Inorganic 2 Phenazine 24 Phosphates 3 Pyridine 25 Carboxylic acids 4, 8 Pyrazine 26 Aliphatic 4, 8 Aromatic 7, 8 Quinoline 27 Phenols 9 Quinazoline 27 Alcohols and oxygen acids 10, 11 Quinoxaline 27 Amino Acids 12 Special Nitrogen Compounds 28 Peptides 13 Hydroxylamines 28 Nitrogen Compounds 14
Kw = Ka x Kb
pKa + pKb = 14 turning Ka, Kb, Kw ; into pKa, pKb, pKw turning pKa, pKb, pKw into Ka, Kb, Kw equation for the self ionisation of ; water relationship
Chapter 16-1, 3-5: Acidity and Basicity; Enolization/Enolate
Instead of using the basicity scale (pKb), the dissociation acidity (pKa) of the conjugate acids is typically used So, a stronger base has a higher pKa of its conjugate acid H N H H BH B + H pKa H3CN H H H pKa 10 6 pKa 4 6 H N H H H Because of the delocalizable N lone pair in aniline (as a result of resonance with the benzene π-system), the
Titration of a weak acid with strong base - KSU
- Example: - HCl is a strong acid , it has 1×107 Ka value and -7 pKa value - CH3COOH is a weak acid , it has 1 76 x 10-5 Ka value and 4 75 pKa value - Type of weak acid and how did they dissociate:
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