In the extraction of caffeine from cola experiment, you need to add some aqueous solution of ammonium hydroxide to your cola sample before performing the extraction step.
Assume that you have 25 mg of caffeine in 40 mL cola sample, and you have the choice of adding 10 mL or 30 mL of ammonium hydroxide.
In which case do you expect to recover more caffeine with 30 mL dichloromethane in a one-step extraction?