Need help wit determining the limiting reagent Part B. Reduction of borneol. If
ID: 715907 • Letter: N
Question
Need help wit determining the limiting reagentPart B. Reduction of borneol. If it does, show your ned Camphor to Isoborneol Reductions. The camphor obtained in Part A should not con intrared spectrum to in Part A, or after the your instructor and ask for advice. If the amount of camphor obta sublimation if you did this, is less than 0.25 g, obtain some can camphor ement your yield. If the amount is more than 0.25 g. scale up on the following amounts. Add 1.5 ml of methanej to the cam- if from the supply shelf to your sir with a glass stirring rod until the camphor has dis- borohydride to the phor contained in.a.50-mL flask. S solved. In portions, cautiously and intermittentiy a solution with a spatula. When all of the on a warm hot plate (low setting) for 2 minutes add 0.25 g of sodium a spatula. When all of the borohydride is added, boil the contents of the fhs minutes, n and Analysis of Product. Allow the reaction mixture to cool for several minutes add 10 mL of ice water. Collect the white solid by fitering it on a Hirsch funne llow the solid to dry for a few minutes. Transfer the solid to a dry Isolatio and, by using suction, a dissolve the product Once Erlenmeyer flask Add about 10 mL of methylene chloride to product has dissolved (add more solvent, if drous sodium necessary), add about 0.5 g of granular anhy m sulate to dry the solution. When dry, the solution should not be cloudy If the still cloudy, add some more granular anhydrous sodium sulfate. Transfer the solu- on the drying agent into a preweighed dry flask. Evaporate the solvent in a hood, as described previously 2011 Cengage Lear ng Ali Rights Reserved. May not be scanned copied or duplicated. O posted to Al Rights Reserved. May not be scanned. copied or duplicated. or posted to a publidy accessible website. n
Explanation / Answer
In a reaction aA+bB = cC, where A, B are reactants, C is the product and a,b,c are the stoichiometric coefficients.
Now in a reaction mixture, it is difficult to be absolutely precise with the number of moles of the reactants. Suppose a1 moles of A and b1 moles of B are added to a reaction mixture. Without loss of generality, let us suppose a1 = 2a, and b1 = b/2.
We know that a moles of A react with b moles of B. In our experiment, we have b/2 moles of B, which will react with a/2 moles of A to give c/2 moles of C. The extra amount of A in the reaction( 1.5a moles) will remain unreacted.
The product concentration is determined by the reactant which is limiting, in other words, is present in less amount.
This is called the law of limiting reagents.