Advertisements for a new espresso maker claim that by increasing the temperature of the water

Advertisements for a new espresso maker claim that by increasing the temperature of the water pushed through the coffee grounds that it can significantly increase the concentration of caffeine in the resulting espresso.

Describe an experiment that would provide strong evidence for evaluating this claim.  Strong essays are generally between 300 and 500 words (275 words is no problem) in length and include several references.

Caution: The claim is not that the espresso tastes better!

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