394 DIY Science: Illustrated Guide to Home Chemistry Experiments
RQEWEvI UESTIOnS
q 1 : You have used Marquis reagent to test a sample that is suspected to contain codeine. The reagent yields a purple color, which
apparently confirms that codeine is present, but the purple color is less intense than you expected. Using the reagents you have on
hand, what might you do to verify or disprove the positive Marquis test?
q: 2 You have a sample that you suspect contains morphine or opium, but not both. Which reagent would you use to discriminate
between the two? If the sample tested negative for morphine, would you run additional presumptive tests? If so, why, and which test or
tests would you run?
dISoALp S :
dilute all solutions with at least three or four times their volume of
tap water and then flush them down the drain with plenty of water.