- Weight Of Conical Vial 23 560 Weight Of P Anisalenud Vial 22 1939 Weight Of Accetophenone Vial 22 8832 Weight Of 1 (41.82 KiB) Viewed 11 times
- Weight Of Conical Vial 23 560 Weight Of P Anisalenud Vial 22 1939 Weight Of Accetophenone Vial 22 8832 Weight Of 2 (84.91 KiB) Viewed 11 times
7. (3 pts.) Give three possible reasons why your yield of the crude product is less than the theoretical yield. You can mention mechanical, losses, but if you do, you have to be specific about exactly what the mechanical loss might be due to. Mechanical losses can only be two of your three possible reasons. For example, one source of mechanical loss might be transferring the recrystallized material from the filter paper to the drying plate, the loss may be because you don't collect all of the crystals, and some may be lost at this point. You can't use this exact example now that we have given it to you. This example is to show you how to provide a valid reasoning for a form of mechanical loss. There are many more. M 8. (1 pt.) Give the weight and the number of moles of your purified (recrysta lized product). Assume that all of the purified material is product, even though this may not be true. Show all equations and don't forget units. 15 9. (1 pt.) Calculate the percentage yield of the purified product by dividing the number of moles of the product by the theoretical yield in moles (and then multiply by 100 to get the percentage). 10 (2 pts.) Give at least two reasons why your recrystallization yield may not be 100%. You can mention mechanical losses, but if you do, you have to be specific in your reasoning (see question 7 above), and mechanical losses can only be one of your two possible reasons. 11. (1 pt.) Give the melting point ranges for the crude and for the purified products (indicate which is which). Putified product S 75.6°C -78.3°C Chucle = 150c-75.12. 12. (2 pts.) Briefly explain how the melting point range and the melting temperature can give you information about relative purity of the crude and purified products. Give just one sentence only, you do not need to give a lot of detail, just a rough idea. ua th