According to the label, the commercial glass cleaner Windex contains 8 ingredients; however, upon GC analysis only 7 compounds could be identified. Sodium dodecylbenzene sulfonate could not be located in the chromatogram.  Why might this be the case?      A) The sodium dodecylbenzene sulfonate evaporated before analysis could take place     B) The sodium dodecylbenzene sulfonate has a very high boiling point     C) The sodium dodecylbenzene sulfonate elutes at the same exact time as another component of the mixture     Answers A & B     Answers A & C     Answers B & C     Answers A, B, & C

Extraction of Caffeine Post-lab 1. What group of organic compounds does caffeine belong to? 2. Draw the structure of caffeine as a line formula. Redraw the structure of caffeine,showing all carbon and hydrogen atoms. 3. What is the molecular formula for caffeine? Use the molecular formula of caffeine tocalculate its molecular weight. 4. What does it mean for two solvents to be immiscible? 5. On the report sheet, you calculated your percent recovery of caffeine. a. If your percent was less than 90%, give at least one reason why it was less. b. A group of students have their percent yield more than 100%, give at least one reasonwhy it was more than 100%. Do NOT simply say “human error.” Be specific about the typesof errors (human or otherwise) that may have occurred, leading to a recovery more than eorequal to 100% (Is this possible Why?)   6. Based on what you observed during this experiment, is dichloromethane denser OR lessdense than water? Explain your reasoning. 7. Based on what…

If 80% of a desired compound is extracted into the organic phase in each step (leaving 20% in the aqueous layer), how many extractions are necessary to ensure that at least 99% of the compound has been recovered in the organic phase?      1 extraction     2 extractions     3 extractions     4 extractions

You are given a pure unknown compound with a melting point of 118 – 120°C, which is either mandelic acid (lit. mp = 118 -120°C) or succinic anhydride (lit. mp = 119 – 120°C), along with pure samples of mandelic acid and  succinic anhydride.  You determine the mp of an approximately 50:50  mixture of the unknown sample and succinic anhydride to be 118-120° C.  What is the identity of the unknown sample? a. succinic anhydride b. mandelic acid