Tom, an analytical chemist, bought a bag of decaffeinated coffee from a grocery store. However, Tom suspected that he might have received regular coffee and therefore decided to analyze his coffee for caffeine. In the lab, he took 0.5 mL of the brewed coffee and diluted it in water to make a 100.0 mL solution. He performed four analyses and found the concentrations to be 4.69, 3.99, 4.12, and 4.50 mg/L, respectively. (Assume the density of all solutions is 1.000 g/mL, 1oz= 28.35 mL). (a) Report the concentration (in mg/L) of caffeine in the brewed coffee using the format as average ± standard deviation. (Note this is not the concentration in the diluted solution.) (b) Look up the caffeine content of regular vs. decaffeinated coffee. Do you think that Tom was given the wrong type of coffee? (c) Caffeine intake of 300 mg per day reportedly has no adverse effects in the vast majority of the adult population. If Tom drinks 3 cups (8 oz/cup) of this coffee daily, is his intake within this known safe zone
Tom, an analytical chemist, bought a bag of decaffeinated coffee from a grocery store. However,
Tom suspected that he might have received regular coffee and therefore decided to analyze his
coffee for caffeine. In the lab, he took 0.5 mL of the brewed coffee and diluted it in water to
make a 100.0 mL solution. He performed four analyses and found the concentrations to be 4.69,
3.99, 4.12, and 4.50 mg/L, respectively. (Assume the density of all solutions is 1.000 g/mL,
1oz= 28.35 mL).
(a) Report the concentration (in mg/L) of caffeine in the brewed coffee using the format as
average ± standard deviation. (Note this is not the concentration in the diluted solution.)
(b) Look up the caffeine content of regular vs. decaffeinated coffee. Do you think that Tom was
given the wrong type of coffee?
(c) Caffeine intake of 300 mg per day reportedly has no adverse effects in the vast majority of
the adult population. If Tom drinks 3 cups (8 oz/cup) of this coffee daily, is his intake within
this known safe zone?
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