Draw the structure of the predominant form of CH3CH2NH3+ (pKa = 11.0) at pH = 6.
Draw the structure of the predominant form of CH3CH2NH3+ (pKa = 11.0) at pH = 6.
Homework Answers
The problem is based on the concept of acidity. If at equilibrium, products are added, the reaction shifts backward generating more reactants. And if reactants are added at equilibrium, the reaction shifts forward.
Weak acid and weak base do not dissociate completely and equilibrium is set up between the reactants and products.
Ethyl ammonium ion
is a weak acid and dissociated as follows:
When is at pH 6, the predominant form would be only.
The pH is acidic means 
is added to the system. Hydrogen ion, 
is a product in the equilibrium reaction. So, according to Le-Chatlier’s principle when 
is added to the system, 
reacts with to form. So, the major species is .
The predominant form is as follows:
.
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Draw the structure of the predominant form of CH3CH2NH3+ (pKa = 11.0) at pH = 6.
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