Caffeine content (mg)
80-125 per cup
2-4 per cup
30-75 per cup
5-40 per cup
6 per ounce
46 per 12 ounces
•K D (solubility coefficient) – ratio of solute in the two solvent
Caffeine was extracted from 10.0 grams of tea leaves
(containing 0.5% caffeine) by solid-liquid extraction using
100.0 ml of water and liquid-liquid extraction using DCM.
Initial tests on the solubility of the caffeine on the two solvents
require 2.5 ml of DCM and 20.0 ml of distilled water to
completely solubilize 100.0 mg of caffeine.
Compute for KD
How much caffeine can be extracted by two successive
extraction using 30.0 ml of DCM per extraction procedure?
How much caffeine can be extracted by single extraction
using 60.0 ml of DCM?
FORMULA FOR MULTIPLE
Xi = amount left in aqueous layer
X0 = original amount in aqueous layer
Vaq = volume of aqueous layer
Vorg = volume of organic layer
i = number of extractions