You need to separate a mixture of caffeine and benzoic acid. The sample has an initial...

You need to separate a mixture of caffeine and benzoic acid. The sample has an initial weight of 2.00 g and a content of 25.0% caffeine. You use dichloromethane, 10.0% NaOH solution, and 10.0% HCl. You are able to isolate 0.60 g caffeine and 1.00 g benzoic acid. Complete the following calculations and show your work.

i)Calculate the amounts of caffeine and benzoic acid in the initial sample.

ii) How much 10% NaOH solution would be needed to neutralize all benzoic acid?

·iii) How much drying agent, MgSO₄, would be needed for drying of 20mL dichloromethane solution that contains 0.01% water, knowing that each mole of MgSO₄ can absorb 7 moles of H₂

Expert Solution

queen_honey_blossom answered 2 years ago

Spectrophotometric Analysis of a Mixture: Caffeine and Benzoic Acid in a Soft Drink Benzoic Acid 230nm...

Spectrophotometric Analysis of a Mixture: Caffeine and Benzoic Acid in a Soft Drink Benzoic Acid 230nm 270nm 2mg/mL 0.231 0.034 4mg/mL 0.390 0.051 6mg/mL 0.539 0.058 8mg/mL 0.685 0.070 10mg/mL 0.888 0.094 Caffeine 230nm 270nm 4mg/mL 0.935 1.525 8mg/mL 0.285 0.442 12mg/mL 0.428 0.703 16mg/mL 0.624 1.066 20mg/mL 0.724 1.226 Soft Drink 230nm 270nm 2mL 0.738 0.273 4mL 1.313 0.522 Mountain Dew Caffeine:54mg/12fl oz Measure the ultraviolet absorption spectrum of the 2:100 and 4:100 dilutions of the soft drink. Find...

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