H3. You are assigned a task to use a 3-stage mixer-settler extraction unit to extract at least 90% of azithromycin from a clarified fermentation broth. The n-butanol (extraction solvent) flows at 25 liters/h, while the clarified broth flows at 80 liters/h. The partition coefficient of azithromycin is adjustable by changing the pH. What minimum value of the partition coefficient should you use for the successful completion of your assigned task? Known/unknown: Equation: U