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A buffer is prepared containing 0.20 M acetic acid and 0.10 M sodium…
Question
A buffer is prepared containing 0.20 M acetic acid and 0.10 M sodium acetate. The ionization constant of acetic acid is Ka = 1.8 x 10^-5. Calculate the pH of the buffer solution. Give the answer rounded to three decimal places.
✓ Verified answer: 4.444checked by our engine — not a guess
Step-by-step solution
Use the Henderson-Hasselbalch equation: pH = pKa + log([salt]/[acid]). pKa = -log10(1.8e-5) = 4.7447. log10(0.10/0.20) = log10(0.5) = -0.3010. pH = 4.7447 - 0.3010 = 4.444. Final answer: 4.444
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