Question

Part A

When performing today’s experiment, your lab partner decides to add all the reagents into one beaker instead of two separate beakers. After adding everything together and waiting a significant amount of time, you see no reaction occur. What was the problem?

Answer 1

la effecis this experiment, you will perform one or two chemiluminescence reactions of sensitizers on the veaction Wear- tential carne cals. Similarty, wearing gloves is a gond and their solations need to be placed in SAFETY NOTES: Safery goggles are required for all experimeats is a pu Flucrescent molecules ure ofien carcino ing ploves prvcaution when handling hydrogern p is recommended when handling these chemi peroside solutions Hal iocart appropriate wiste contain Experimental Procedures Part A: Aqueous Version from aqucos aqueous waste and son-halogenated organic waste details may perform this esperiment by yourself or in ill provide ou Weigh out 1.20 g sodium carhonate: add it to the flask along cytinder to measuse the water. Swirl to dissolve. groups: our instructor w Obtain a S00 al. Erleumeyer flas with 250 imL of water. Lise a 100 ml Weigh out and add tbe following to the flask: 0.0 lum sodium bicarbonate, 0,15 g aimonium carbonate mono hydrate. Swisl to dissolve gradualed monchydrate, and 0.12 g copper sulfase mono- and add 250 mL water. This is soluticn A obtain a second 500 mL flask. Measure out 2.5 mL of 30% hydrogen peroxide using graduated cylinder and add to the flask. Add 298 ml of waler. Ti peroxide using a l solution Obtain three 200 mL beakers, Us to each beaker. To the second beaker, add approximately I im Sing a 100 ml·graduated cylinder, add 75 mL of solution A of fluorescein solution. To the are using a dropping third beaker, add approximately 1/4 ml, of the thodasnine B solutio bottle, add about 1/4 dropper full of the dye solutions.) pproximately 1/4 ml of the rhodanin The addition of solution B will initiate the cheniluminescence r reaction, The reaction is best Your instructor will determine how low the lights can observed when the lights aure turned down. safely be turned down. Your instructor may ask everyone to wai class is ready) Using a 100 mL graduated cylinder, meusure out 7 mL of solution B. Add io the r stir with a glass Stirring rod. Record your observations, including color and intensity cord the resuits. Finally, add ml, of solution B to the third beaker and stir: record the results. Dispose of the solutions in the Similarly, add 75 ml. of solution B to the second beaker and stir, re appropriate waste containers. Part B: Nonaqueous Version Obtain a 10 mL and 25 ml. graduated eylinder and a 20 ml und two 100 ml beakers. Measure out 1.5 mL of 30% hydrogen peroxide and place in the 20 mL beaker. Also add 13.5 mL of wa- er to the beaker. Add 7.5 mL. of the diluted hydrogen peroxide solution that you just made to each of two 100 mL beakers. Add 20 mL of dichloromethane to each beaker. Add 0,005 g of 9,10-bis(phenylethynyl)janthracene to nylanthracene to the other heaker: label the beaker D. Cover with plastic wrsp or Parafilm(R) and place the mixture in a hood until ready to add the oxalyl solution. (As water and di are immiscible, two layers should be present.) one beaker, label the beaker C. Add 0.005 g of 9.10-diphe- chloromethane

1.It depends on the rate of reaction of all those chemicals that you are mixing.

2.That mechanism must not have occurred (due to improper mixing of solutions) since chemoluminescence depends on exciting of atoms or molecules and quenching .

3.The proportions of the chemicals may not be accurate.

4. difference in the reaction rates of solutions when added. Some reactions needs heat input.

5. May be you are trying to observe the chemiluminiscence in presence of external light, please switch-off light, best viewed in the dark room.

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