Case 1: i OH unionized form pH = 7 most likely ionized form % ionized at pH = 7

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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One form of Henderson-Hasselbalch Equation shown below
can be
derived from the generic equation for an acid-dissociation reaction. It is useful for approximating the pH
of an aqueous buffer. The expression can also be arranged to solve for pKa or the ratio of [conjugate
base] [acid] or [base]: [conjugate acid] depending on the functional group being ionized.
Case 1:
HA
OH
unionized form
Ka
+
H
Acid Dissociation Reaction
pH = 7
derivation
Consider the two different cases below. Decide if the compound shown is most likely acting as a base or
acid then draw the most likely ionized form of the compound as it would exist at pH 7. For each case
calculate the % ionization.
pH = pka + log
A
[HA
Henderson-Hasselbalch Eqn.
(solving for pH)
most likely ionized form
% ionized at pH = 7
Transcribed Image Text:One form of Henderson-Hasselbalch Equation shown below can be derived from the generic equation for an acid-dissociation reaction. It is useful for approximating the pH of an aqueous buffer. The expression can also be arranged to solve for pKa or the ratio of [conjugate base] [acid] or [base]: [conjugate acid] depending on the functional group being ionized. Case 1: HA OH unionized form Ka + H Acid Dissociation Reaction pH = 7 derivation Consider the two different cases below. Decide if the compound shown is most likely acting as a base or acid then draw the most likely ionized form of the compound as it would exist at pH 7. For each case calculate the % ionization. pH = pka + log A [HA Henderson-Hasselbalch Eqn. (solving for pH) most likely ionized form % ionized at pH = 7
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