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Dax soni Chem. 261 Purpose: - The purpose of this experiment is to extract and mea veritable the caffein in a afternoon tea theme by disclose caffeine from the tea bag and to know the amount of caffeine present in a tea bag by using extraction technique, centrifugation techniques, and by purifying caffeine by sublimation. Reference: - Williamson, k. Minard R. Masters K. Macro sale and micro sale. infixed experiment 2007, 5th edition pg 135-171. Procedure: - First, after eubstance of piddle with boiling worry and Na2co3 boils, pull beaker from anchor bath, do away with stick and then add tea bag. Remove tea bag and squeeze into beaker. Hirsh funnel can be employ to certification tea bag while pressing vanquish on it. later removing the first tea bag, return the analogous ascendant to the sand bath with boiling stick, reheat to boiling, remove from sand bath, remove boiling stick and add a endorse bag. Do not use more than 1 or 2 ml of very hot water to scour tea bag. Total volume of dark tea root word should be no more than 12 ml. Pour tea solution into two kit 15 ml extractor electron tube splitting the volume almost in fractional in all(prenominal) spin tube and cool on ice. Add 2 ml of CH2CL2 to each tube and hack and shake vigorously or apace vortex tubes uncrowned tubes for 15 seconds each so both(prenominal) forms mix well.

centrifugate to break emulsions and obtain two explicit layers. Cool centrifuge t ubes on ice to room temp. Do not ! pick out centrifuge tubes more than 4/5 full. Be sure to balance tubes when using centrifuge Keep track of your tubes. After the extraction step, however do not throw any extraction layers out until you beat finished the experiment. Remove the hoy colored bottom layer with glass pipette by first squeezing pipette bulb gently to capture small air bubbles as you direct the glass pennant to the bottom of the tube. Then tardily release pressure in bulb to such...If you want to get a full essay, cabaret it on our website: BestEssayCheap.com

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