9. Which of the following solutions has the greatestbuffering capacity?

[A] 0.243 M HFand 0.192 M NaF

[B] 0.485 M HFand 0.383 M NaF

[C] 0.970 M HFand 0.766 M NaF

[D] 0.160 M HFand 0.126 M NaF

[E] They are all buffersolutions and would all have the same capacity.

10. The Henderson-Hasselbalch equation is________

[A] pH = pK_a +log [acid]/[base]

[B] [H⁺] =K_a + [base]/[acid]

[C] pH =log [acid]/[base]

[D] pH = pK_a -log [base]/[acid]

[E] pH = pK_a +log [base]/[acid]

7. Calculate the pH of a solution prepared bydissolving 0.150 mol of benzoic acid and 0.300

mol of sodium benzoate inwater sufficient to yield 1.00 L of solution. TheK_a of benzoic

acid is 6.30 x 10^-5.

[A] 2.516 [B]4.502 [C] 3.892 [D] 4.195 [E] 10.158

8. What change will be caused by addition of a smallamount of HCl to a solution containing

fluoride ions and hydrogenfluoride?

[A] The fluoride ions willprecipitate out of solution as its acid salt.

[B] The concentration of fluorideion will decrease and the concentration of hydrogen

fluoride willincrease.

[C] The concentration of hydroniumions will increase significantly

[D] The concentration of hydrogenfluoride will decrease and the concentration of

fluorideions will increase.

[E] The concentration of fluorideions will increase as will the concentration of hydronium

ions.

11. The addition of hydrofluoric acid and ________ towater produces a buffer solution

[A] HF [B] KI [C] NaF [D] NaBr [E] NaNO₃

Answer rating: 100% (QA)

Answer 9 C 0970 M HFand 0766 M NaF This has the greatest buffering capacity because it has the highe... View the full answer