General Chemistry Behind the Scenes Lauren Pintabona ltc

General Chemistry: Behind the Scenes Lauren Pintabona ltc 4@wildcats. unh. edu; Parsons Hall, 23 Academic Way, Durham NH 03824 Introduction For the past three years I have been working for Amy Lindsay setting up and preparing all of the Gen. Chem. labs. Even though this may seem like a simple job, it requires a lot of hard work and patience. Multiple labs are performed in the same week and most of the labs also consist of more than one part, meaning organization is key. If the labs are not set up and all solutions prepared by lab day the procedure cannot be performed, therefore imposing deadlines that must be met. The lab experience of the students relies on the work we put into setting up and preparing for every experiment. Despite these obstacles, the overall experience has been very rewarding. I picked up new tips and tricks along the way and I was able to practice the techniques I’ve learned throughout my college career. Chemical Timer Acids, Bases, and p. H In Prep Room Purpose: • prepare stock solutions to be used by students in • Prepare a variety of acids, bases, and salts to be used to analyzing reactions and preparing solutions of their understand p. H range, strong vs. weak, and concentrated vs. own dilute Solution preparation in the prep. room For each of the 24 chemicals: In Lab Purpose for Students: • To understand the concepts involved • Calculate amount of solid for the desired molarity For each of the 4 labs: • Prepare two 50 m. L bottles • 1 test tube rack per lab bench • Fill test tubes accordingly in oxidation reduction reactions and • 1 well plate to experiment with the starch test Chemical reactions: Solution preparation in the prep. room I 2(aq) + 2 S 2 O 32 (aq) 2 I (aq) + S 4 O 62 (aq) In Lab S 2 O 32 (aq) + 2 I (aq) I 2(aq) + 2 SO 42 (aq) Original Color I 2 S 2 O 32 SO 4 2 S 2 O 82 In lab set up for students I 2 S 2 O 32 - SO 42 - S 2 O 82 - I- Cl- I Cl Acknowledgements For each of the 4 labs: • 2 test tube racks with all 24 chemicals (labeled) • 2 of each type p. H paper In lab set up for students Chemical reactions: Ni. Cl 2(aq) + 2 H 2 O(l) Ni(OH)2(aq) + 2 HCl(aq) Na 2 CO 3(aq) + 2 H 2 O(l) H 2 CO 3(aq) + 2 Na. OH(aq) Ni 2+ CO 32 (aq) + 2 H 2 O(l) H 2 CO 3(aq) + 2 OH (aq) + 2 H 2 O(l) Ni(OH)2(aq) + 2 H+ (aq) Observation table for lab notebooks Thank you so much to Amy Lindsay for helping me and working with me these past 3 years. A special thanks to the Chemistry Department and my fellow classmates, the class of 2013.