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If a buffer solution is 0.540 M in a weak acid ( K a = 8.0 × 10 − 6 ) and 0.230 M in its conjugate base, what is the pH?

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dsdrajlin

Answer:

4.7

Explanation:

Given data

  • Concentration of the weak acid: 0.540 M
  • Concentration of the conjugate base: 0.230 M
  • Acid dissociation constant (Ka): 8.0 × 10⁻⁶

We can calculate the pH of a buffer system using the Henderson-Hasselbalch's equation.

pH = pKa + log ([base]/[acid])

pH = -log (8.0 × 10⁻⁶) + log (0.230 M/0.540 M)

pH = 4.7

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