Problem: The pKa of acetic acid CH3COOH is 4.76. A buffer solution contains CH3COOH and CH3COONa and has a pH of 4.76 and a total acetate concentration (acid and base forms) of 0.400 M. What is the concentration of CH3COOH?

🤓 Based on our data, we think this question is relevant for Professor Staff's class at UTSA.

FREE Expert Solution

Recall the Henderson-Hasselbalch equation:

pH=pKa+logconjugate baseweak acid

the ideal buffer is when the amount of conjugate base is equal to the amount of the weak acid.

[conjugate base] = [weak acid]

pKa = pH

conjugate baseweak acid=1

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Problem Details

The pKa of acetic acid CH3COOH is 4.76. A buffer solution contains CH3COOH and CH3COONa and has a pH of 4.76 and a total acetate concentration (acid and base forms) of 0.400 M. What is the concentration of CH3COOH?

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Based on our data, we think this problem is relevant for Professor Staff's class at UTSA.