Laboratorio

University of Puerto Rico
Bayamón Campus
Department of Chemistry


















Laboratory #6
Reactions Rates and Equilibrium






















By:Andrenid Ramos y Gianna Gómez
Fundamental Gneral Chemistry Laboratory
Lab 3023 – VJ1
Profa. Marcia Balaguera
Introduction
In this laboratory we work with reactions rates and equilibrium. Whiledoing the experiments we learn about exothermic and endothermic reaction. In this part we worked with NH4NO3 crystals and CaCl2 in two test tubes with water to describe if the reaction wasendothermic or exothermic (among other things such as change of temperature). At the end we measure the time required to complete dissolve the Mg on threes samples on three test tubes, one with 1.0 M HCl,another with 2.0 M HCl and the third one with 3.0 M HCl. Then we place 10 mL of vinegar in two test tubes, the frist one was heated and the second one was on cool temperature and by adding a scoop ofNaHCO3 we observed and compared to ultimately determine which test tube cleared first.














Purpose
The different goals we have to achieve at the end of the lab were:
•Identify a reaction as exothermic or endothermic.
• Identify the factors that affect the rate of reaction.
• Observe that chemical reactions are reversible.
• Discuss factors that cause ashift in equilibrium.



















Data
A. Exothermic and Endothermic Reactions
A.1 NH4NO3 CaCl2
Initial temperature 22.8 ̊C 22.8 ̊C
Final temperature13.7 ̊C 26.1 ̊C
Temperture change 9.1 ̊C -3.3 ̊C
A.2 Endothermic or exothermic endothermic exothermic
A.3 Equation (add heat)
H2ONH4NO3 (s) NH4+(aq) + NO3- (aq)
Δ
H2O
CaCl2 (s) Ca2+(aq) + 2 Cl- (aq)
B. Rates and Reactions
B.1 Amount...