please help 1) After introducing 1.0 g of potassium carbonate into the centrifug

Question

please help

1) After introducing 1.0 g of potassium carbonate into the centrifuge tube containing the hot water extract, it was capped, shaken, and then cooled to room temperature. Following this, roughly 3ml of dichloromethane was added and the mixture shaken for one minute. why wasn't the dichloromethane placed in the centrifuge tube with the carbonate and the warm extract in one step?Hint check the boiling point. where do the carboxylic acid end up.

2) Why is it important to add ice water to the cold finger after the vacuum has been turned on in your sublimation apparatus?

3) If a cup of tea (100 ml) contains 40 mg of caffeine, what is the molar concentration of caffeine in tea?

Explanation / Answer

3) molarity = weight of solute *1000/(m.wt of solute*volume of solution)

     molarity = (40*10^-3 *1000)/(194.19*100)

    molarity = 0.002M

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