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# boraxlab2 - Experiment 26 Thermodynamics of the Dissolution...

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Simultaneous Detemination of several Thermodynamic Quantities: K, Delta G, Delta H, and Delta S Connie Jamieson 11/3/2011 Instructor: Tiffany Ha Chemistry 212 section 205 Lab partner: Elizabeth Ho Calculations: Trial 1: Moles HCl: (0.250 x 0.0042) = 0.0011 mols of HCl Moles of Borax: 0.0011mols HCl ( 1mol borax/2mols HCl) = 5.3 x 10 -4 mols borax 5.3 x 10 -4 mols borax/0.0050L borax solution used = 0.011M borax Ksp= 4(0.011M) 3 = 0.0046 M 3

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∆G= -(8.314J/mol∙K) x (303K) x ln(0.0046M 3 ) = 13557 J/mol Refer to figure 1: lnKsp=-11444(1/T)+31.8 ∆H (enthalpy) = -11444/8.314= -13542.1 J ∆S (entropy) = 31.8/8.314= 3.83 J/K Table 1:Trial 1 Borax Titration Group HCl (M) Temp (K) Volume Borax used (L) Volume of HCl used (L) Moles HCl (mols) Mole Borax (mols) Concentration of Borax (M) Ksp M 3 1 0.250 308 0.005 0.0033 0.00083 0.00041 0.083 0.0022 2 0.250 298 0.005 0.0060 0.0015 0.00075 0.15 0.014 3 0.250 303 0.0048 0.0016 0.00040 0.00020 0.042 0.00029 4 0.250 298 0.005 0.0020 0.00050 0.00025 0.050 0.00050 5 0.250 313 0.005 0.0105 0.0026 0.0013 0.2625 0.072 6 0.250 295 0.005 0.0040 0.0010 0.00050 0.10 0.0040 7 0.250 303 0.005 0.0042 0.0011 0.0005 3 0.11 0.0046 8 0.250 318 0.005 0.003 0.00070 0.00035 0.070 0.0014 9 0.250 295 0.0051 0.0025 0.00063 0.00031 0.061 0.0009
Table 2: Trial 2 Borax Titration and averages of data Grou p Tem p (K) Volume of HCl used (L) Moles HCl (mols) Volume Borax used (L) Mole Borax (mols) Conc. of Borax (M) Ksp M 3 Average Ksp M 3 ∆G (J/mol) average 1 308 0.0031 0.00078 0.005 0.00039 0.078 0.0019 0.0021 15845.6 2 298 0.0040 0.0010 0.005 0.00050 0.10 0.0040 0.0088 11740.5 3 303 0.0016 0.00040 0.0049 0.00020 0.041 0.00027 0.00028 20602.3 4 298 0.0011 0.00028 0.005 0.00014 0.028 8.3E-05 0.00029 20167.8 5 313 0.0108 0.0027 0.005 0.0014 0.27 0.079 0.076 6721.9 6 295 0.0026 0.00065 0.005 0.00033 0.065 0.0011 0.0025 14647.0 7 303 0.0043 0.0011 0.005 0.00054 0.11 0.0050 0.0048 13450.1 8 318 0.0060 0.0015 0.005 0.00075 0.15 0.014 0.0074 12958.6 9 295 0.00175 0.00044 0.0051 0.00022 0.043 0.00032 0.00062 18122.8 Figure Conclusion: The purpose of this lab was the study of a sparingly salt. The solubility information was determined at various temperatures. The following thermodynamic quantities were determined

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boraxlab2 - Experiment 26 Thermodynamics of the Dissolution...

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