Experiment 8

Experiment 8 - Experiment #8: The Entropy and Enthalpy of...

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Experiment #8: The Entropy and Enthalpy of the Dissolution of Borax Abstract In this experiment, the change in enthalpy and entropy of tetraborate and sodium ions from borax was investigated. It was concluded that the change in enthalpy for the dissolution of borax was 92.2241 kJ/mol and that the change in entropy was 148.41 J/ (mol K). Moreover, knowledge of the relationships between K sp , enthalpy, entropy, and Gibb’s Free Energy was attained. Introduction The purpose of this lab was to investigate the relationships between the K sp , enthalpy, entropy, and Gibb’s Free Energy for the dissolution of borax, using equilibrium and thermodynamic theories. Overall, the goal of the experiment was to calculate the change in enthalpy and entropy of the tetraborate and sodium ions that form in the dissolution of the borax crystal. The balanced equation for this reaction is given below in Equation 1: Na 2 B 4 O 7 *10H 2 O 2Na + + B 4 O 5 (OH) 2- + 8H 2 O (1). A mildly-basic compound (as shown in equation 2 below), borax has been used in soap, as a flux for solder, as a component of glass, and as a preservative. B
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Experiment 8 - Experiment #8: The Entropy and Enthalpy of...

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