The PK_a of CH₃COOH Is 4 $\left[ \mathrm { CH } _ { 3 } \mathrm { COOH } \right] > \left[ \mathrm { CH } _ { 3 } \mathrm { COO } ^ { - } \right]$

question 4

Multiple Choice

The pK_a of CH₃COOH is 4.8 . If the pH of an aqueous solution of CH₃COOH CH₃COO^- is 4.8, then one knows ________.

• A) CH₃COOH is completely ionized
• B) \(\left[ \mathrm { CH } _ { 3 } \mathrm { COOH } \right] > \left[ \mathrm { CH } _ { 3 } \mathrm { COO } ^ { - } \right]\)
• C) \(\left[ \mathrm { CH } _ { 3 } \mathrm { COOH } \right] = \left[ \mathrm { CH } _ { 3 } \mathrm { COO } ^ { - } \right]\)
• D) \(\left[ \mathrm { CH } _ { 3 } \mathrm { COOH } \right] < \left[ \mathrm { CH } _ { 3 } \mathrm { COO } ^ { - } \right]\)
• E) \(\mathrm { CH } _ { 3 } \mathrm { COOH }\) is completely unionized

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