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Introduction

General Chemistry: Behind the Scenes Lauren Pintabona ltc4@wildcats.unh.edu; Parsons Hall, 23 Academic Way, Durham NH 03824. Introduction

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Introduction

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  1. General Chemistry: Behind the Scenes Lauren Pintabonaltc4@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 pH • In Prep Room • Purpose: • prepare stock solutions to be used by students in analyzing reactions and preparing solutions of their own • In Prep Room • Purpose: • Prepare a variety of acids, bases, and salts to be used to understand pH range, strong vs. weak, and concentrated vs. dilute • For each of the 24 chemicals: • Calculate amount of solid for the desired molarity • Prepare two 50 mL bottles • Fill test tubes accordingly Solution preparation in the prep. room In Lab • Purpose for Students: • To understand the concepts involved in oxidation-reduction reactions and to experiment with the starch test • For each of the 4 labs: • 1 test tube rack per lab bench • 1 well plate Chemical reactions: I2(aq) + 2S2O32-(aq)2I-(aq) + S4O62-(aq) S2O32-(aq) + 2I-(aq)  I2(aq) + 2SO42-(aq) Solution preparation in the prep. room • In Lab • For each of the 4 labs: • 2 test tube racks with all 24 chemicals (labeled) • 2 of each type pH paper In lab set up for students • Chemical reactions: • NiCl2(aq) + 2H2O(l)Ni(OH)2(aq) + 2HCl(aq) • Ni2+(aq) + 2H2O(l)Ni(OH)2(aq) ­+ 2H+(aq) Na2CO3(aq) + 2H2O(l)H2CO3(aq) + 2NaOH(aq) CO32-(aq) + 2H2O(l) H2CO3(aq) + 2OH-(aq) In lab set up for students Acknowledgements 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. Observation table for lab notebooks

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