Question-Completion Status: QUESTION 1 What is the function of Separatory funnel ? It separates organic layer from aqueous layer based on density. It separates only aqueous layer It separates only organic layer. QUESTION 2 Caffeine is more soluble in water than dichloromethane (CH2Cl2)? True False QUESTION 3 Why do you add anhydrous sodium sulfate in extracted caffeine? Just to have some reaction. None of the above. It removes all the color from extracted caffeine and make caffeine clear It absorbs water and brown tannin from extracted caffeine. MacBook Pro

QUESTION 4 Student pipette 5 ml of stock caffeine in a test tube and diluted with 1 ml of distilled water. Total volume in test tube is 6 ml. If the concentration of stock caffeine is 10 mg/ml, what would be the concentration of caffeine in test tube?( M1 V1 = M2V2) 12.0 mg/ml 8.33 mg/ml 0.833 mg/ml 0.0833 mg/ml QUESTION 5 After plotting the graph between Absorbance of Caffeine and Concentration of Caffeine, student got the equation for calibration plot as Y-0.021X + (-0.0231). If the Absorbance of Student’s caffeine is 0.248, what would be the concentration of student’s caffeine in mg/ml? 0.129 mg/ml 12.91 mg 12.91 mg/ml 10.0 mg/ml. Save All Answers