What is the minimum volume in mm of 0.1 M HCl solution that must be added to com
ID: 826394 • Letter: W
Question
What is the minimum volume in mm of 0.1 M HCl solution that must be added to completely exceed the buffering capacity of a 0.2 M solution acetic acid/acetate buffer? The concentration of the acetic acid and the acetate are 0.1 M respectively. (pKa = 4.76).
a.) Using the H-H equation, calculate the pH of the buffer solution before the addition of HCl solution.
b.) Complete an ICE table:
______ I Acid <---------> Conjugate base I ______
______ I _CH3COOH_ I __CH3COO-___ I _H2O_
Initial__I __0.1_______ I ____0.1 ______ I ______
Change I ___________ I ______________ I ______
Equilibrium I ________I _______________ I ______
c.) Now use the number of moles and the concentration of the HCl solution to calculate the volume of HCl that must be added.
Explanation / Answer
a.) pH = pKa + log[salt/acid]
pH = 4.76 + log[0.1/0.1]
pH = 4.76 is the answer
b.) Complete an ICE table:
___OH-___ I Acid <---------> Conjugate base I __H2O____
__OH-____ I _CH3COOH_ I __CH3COO-___ I _H2O_
Initial_0.1_I __0.1_______ I ____0.1 ______ I ______
Change -0.1 I ____-0.1_______ I ___+0.1___________ I ___+0.1___
Equilibrium 0.0 I ____0.0____I ______0.2_________ I ___0.1___
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