Consider the next four questions together. 31. A benzoic acid -benzoate buffer c

Question

Consider the next four questions together. 31. A benzoic acid -benzoate buffer contains 0.1460 M benzoic acid and 0.1258 M benzoate ion Calculate the pH of the buffer. Benzoic acid K, -6.3x10 32. A benzoic acid -benzoate buffer contains 0.1460 M benzoic acid and 0.1258 M benzoate ion. Will the acid buffer capacity or the base buffer capacity be larger? Choices: Acid buffer capacity will be larger, Base buffer capacity will be larger, They will be the same, Not enough information to decide benzoic acid -benzoate buffer contains 0.1460 M benzoic acid and 0.1258 M benzoate ion. A hemist adds 0.0075 mol of HCI to 1.00 L of buffer. Calculate the new pH when the reaction is finished. Assume the total volume is still 1.00 L. Benzoic acid K 6.3x10 33. A 34. A benzoic acid-benzoate buffer contains 0.1460 M benzoic acid and 0.1258 M benzoate ion. A chemist adds 0.0185 mol of NaOH to 3.00 L of buffer. Calculate the new pH when the reaction is finished. Assume the total volume is still 3.00 L. Benzoic acid K, - 6.3x10s

Explanation / Answer

31)

concentration of acid = 0.1460

concentration of salt = 0.1258 M

pKa = 4.20

pH = pKa + log [salt / acid]

      = 4.20 + log [0.1258 / 0.1460]

pH = 4.14

32)

Acid buffer capacity is larger.

33)

pH = pKa + log [salt - C / acid +C]

    = 4.20 + log [0.1258 - 0.0075 / 0.1460 + 0.0075]

pH = 4.09

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