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CHEM 1212K Freshman Chemistry Program TA Notes, Experiment 21 Fall 2015 1 Experiment 21: Thermodynamics of Borax Dissolution Post-lab Assignment or Report Sections to be included in this lab report are: •Data & Results •Discussion •Conclusion •References The lab report for this experiment is due at the beginning of the following lab period. Learning Objectives Students will be able to… •Use titration of a known mass of base to determine an unknown concentration of acid with good precision (this method is called “standardization”). oCarry out good titration techniques leading to reliable data. oUse stoichiometry calculations and reactions occurring during a titration to convert from a known mass of base to an unknown amount of acid (and concentration). •Use titration with a standardized solution to determine an unknown concentration. •Calculate a solubility product Kspfrom measured concentrations at different temperatures. •Determine enthalpy and entropy of dissolution using measurements of Kspat different temperatures. Talking Points for Pre-lab Discussion •Discuss the dissolution equilibrium of borax that will be studied in this experiment. ooWhat is the form of Kfor this equilibrium? Ask students about this!