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

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, 6.3x105 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 33. A benzoic acid -benzoate buffer contains 0.1460 M benzoic acid and 0.1258 M benzoate ion. A chemist 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 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 Ka 6.3x105

Explanation / Answer

31) From Henderson-Hasselbalch equation, PH = Pka + log (base/acid)

= 6.3+ log ( 0.1258/ 0.1460)

= 6.3 - 0.06

PH = 6.24

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