When a Small Amount of CH₃(CH₂)₄CO₂H, (PKa~ 4 $\text { ether; } \mathrm { CH } _ { 3 } \left( \mathrm { CH } _ { 2 } \right) 4 \mathrm { CO } _ { 2 } ^ { - }$

When a small amount of CH₃(CH₂) ₄CO₂H, (pKa~ 4.8) is added to a separatory funnel that contains ether and water with a pH=2.0 is found mainly in the ________ layer as ________.

A) $\text { ether; } \mathrm { CH } _ { 3 } \left( \mathrm { CH } _ { 2 } \right) 4 \mathrm { CO } _ { 2 } ^ { - }$
B) $\text { water; } \mathrm { CH } _ { 3 } \left( \mathrm { CH } _ { 2 } \right) 4 \mathrm { CO } _ { 2 } ^ { - }$
C) $\text { ether; } \mathrm { CH } _ { 3 } \left( \mathrm { CH } _ { 2 } \right) _ { 4 } \mathrm { CO } _ { 2 } \mathrm { H }$
D) $\text { water; } \mathrm { CH } _ { 3 } \left( \mathrm { CH } _ { 2 } \right) _ { 4 } \mathrm { CO } _ { 2 } \mathrm { H }$
E) none of the above