Coordination Chemistry 1 Overview Getting Started Techniques Procedure FAQ Full Lab Manual Introduction & Goals Chemistry & Background Key Questions Prelab Problems Safety Procedure In Your Write-up Experiments Index ChemLab Home		FAQ Index Question 1 This experiment seems different from many of our others and I'm not sure what should be in my write-up, besides the procedure and the yield calculations. What else should I write? Question 2 For prelab problem 1, when calculating the molar mass of CuCl2⋅2H2O do we include the molar mass of H2O? Question 3 What exactly is ETHANOL? Is it the the kind of alcohol used as a gasoline substitute or the kind you drink? Submissions Submit a question or an answer to the FAQ Questions & Answers Question 1 This experiment seems different from many of our others and I'm not sure what should be in my write-up, besides the procedure and the yield calculations. What else should I write? During lab, include written observations of what happens in each step of the procedure. This includes things like bubbles, precipitation, dissolution, and color changes. In your discussion, include a summary of your yield results and the overall reaction stoichiometry. Then discuss the type of reactions performed in each step and the purpose of each reagent and procedure in the synthesis. Double-check the lab manual for the important results that should be in your write-up. Question 2 For prelab problem 1, when calculating the molar mass of CuCl2⋅2H2O do we include the molar mass of H2O? Yes, you do. The two water molecules are included in the crystal structure of the solid salt and should be included when the molar mass is calculated. Your calculation of the molar mass of the solid should include 2 x 18 g/mol = 36 g/mol, to account for the mass of the two water molecules. Question 3 What exactly is ETHANOL? Is it the the kind of alcohol used as a gasoline substitute or the kind you drink? Ethanol has the molecular formula CH3CH2OH. As a fermentation product of grains and fruits, it appears in the alcoholic beverages that students of legal age sometimes drink. It is also used as an additive to gasoline. The ethanol used in this experiment is a laboratory reagent not suitable for human consumption with safety information that includes the following warnings: FLAMMABLE, TOXIC, HARMFUL BY INHALATION AND IF SWALLOWED, IRRITATING TO EYES, RESPIRATORY SYSTEM AND SKIN. An alcohol used as an alternative fuel is methanol, commonly called wood alcohol. Its formula is CH3OH, and it has similar safety warnings. Submissions Submit to the FAQ If you have either a question or an answer to a question about this experiment, please email it to your lab instructor. You will receive a reply to your submission, and we may also add it to this FAQ page.
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