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A) Use activity coefficients to find the concentration of hydrogen ions in a solution of 75.0 mM butanoic acid and 0.05 M NaCl. The ionization constant of butanoic acid is Ka = 1.52 × 10-5. Take the size of C3H7COO- to be 500 pm.

B) What is the pH of this solution? (Include activity coefficients in your calculation.)

C) What is the fraction of dissociation of butanoic acid in this solution?

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