You wish to prepare an HC₂H₃O₂ buffer with a pH of 5.14.If the pK_a of is 4.74,what ratio of C₂H₃O₂^-/HC₂H₃O₂ must you use? A) 0.10 B) 0.30 C) 0.40 D) 2.51 E) 5.0

Question

Quizplus · Accepted Answer

Using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the base form (CH3COO-) and [HA] is the concentration of the acid form (CH3COOH). Given pH = 5.14 and pKa = 4.74, we can rearrange the equation to solve for the ratio [A-]/[HA]: 5.14 = 4.74 + log([A-]/[HA]), which gives log([A-]/[HA]) = 0.40. Taking the antilogarithm gives [A-]/[HA] = 2.51.

You Wish to Prepare an HC2H3O2 Buffer with a PH

You Wish to Prepare an HC₂H₃O₂ Buffer with a PH