Data: 1. Percent yield based on expected extraction for the tea bags (See question sheet)

2. All functional groups labeled on the IR.

3. Expected Melting Point for a pure sample of Caffeine (See questions sheet)

1. What layer is caffeine found in? Why is that? Caffeine can be found in the organic layer. The organic reagent that is being commonly used for caffeine extraction is dichloromethane (DCM). The caffeine will go to the organic layer because caffeine has more solubility in DCM than water.

2. Hypothetically you extracted 78.3 mg of caffeine from 2 tea bags. Each bag of tea bags contains 56mg of caffeine. What is your percent yield for this reaction? To get the percent yield we used the equation of % yield = (actual yield) / (theoretical yield) x 100 since there's 56 mg of caffeine in each tea bag the theoretical yield is 56 mg x 2 = 112 mg.

% yield = (78.3) / (112) x 100

% yield = 69.9 %

3. What are the main peaks that caffeine would show on an IR? Main peaks that will appear in the IR spectra of caffeine:

3000 cm-1 amine stretch

3000 cm-1 sp2 C-H stretch

1700 cm-1 C=O stretch

1600 cm-1 C=C stretch

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?

Straightforward questions answered in the powerpoint slidesreaction: heating the starting materials under refluxwhat does it mean to heat under reflux? why do we choose water as the reflux solvent? what are boiling chips used for? why do we put a condenser on top of the reaction? why do we add heat and let the reaction stir for 30 minutes? why do we add sulfuric acid to the reaction after it cools as opposed to when it’s still hot? separation: filtration of precipitatewhy don’t we do an aqueous and organic extraction in the separatory funnel? why do you rinse the salicylic acid on the filter with ice cold water? purification: recrystallization of salicylic acid (no hot filtration needed)what is the difference in the amount of room temperature water vs. boiling water needed to dissolve the salicylic acid (assume a 1.2 gram yield of salicylic acid)? remember, in the lab if you need x ml of boiling water to dissolve a solid, then you should add a little more (definitely no more than 1.5 times the theoretical amount) to ensure it doesn’t recrystallize prematurely.analysis: melting point of salicylic acidwhat can you conclude if the melting point of the salicylic acid you just synthesized is 152-155oc and the 1: 1 mix of your product and “synthetic” salicylic acid is 151-154oc?

What is the lowest number energy level where a d sublevel is found