Chemistry Lab report 11 - Thermodynamics of Borax...

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Thermodynamics of Borax Solubility November 15, 2015
A.) Research Question 1. How do you determine the number of moles in tetraborate? 2.How do you determine the molarity of tetraborate? 3. How do you determine the molarity of Na + ? B.) Observations and Results Table 1:Volumes of HCL and Borax at a given temperature. (M) of HCl Trial Vol of HCL (mL) Vol of Saturated borax (mL) Temp C Temp K 0.5 M 1 7.5 7 10 283.15 0.5 M 2 4 7 11 284.15 0.5 M 3 3.7 7 21 294.15 0.5 M 4 4 7 21 294.15 0.5 M 5 6.4 7 28.6 301.75 0.5 M 6 7.5 7 31.7 304.85 0.5 M 7 11 7 44.4 317.55 0.5 M 8 8.5 7 40 313.15 0.5 M 9 15.5 7 49.1 322.25 0.5 M 10 13.9 7 50 323.15 Table 2:Moles, concentrations, ksp and temperatures of ten trials. rial Moles of HCl Moles of tetraborate Moles of Na Con of tetraborate Con of Na ion Ksp ln Ksp Temp K 1/Temp K 1 0.00375 0.001875 0.00375 0.267857143 0.535714286 0.076872267 -2.565610108 283.15 0.003531697 2 0.002 0.001 0.002 0.142857143 0.285714286 0.011661808 -4.451436086 284.15 0.003519268 3 0.00185 0.000925 0.00185 0.132142857 0.264285714 0.009229774 -4.68532071 294.15 0.003399626 4 0.002 0.001 0.002 0.142857143 0.285714286 0.011661808 -4.451436086 294.15 0.003399626 5 0.0032 0.0016 0.0032 0.228571429 0.457142857 0.047766764 -3.041425198 301.75 0.003314002 6 0.00375 0.001875 0.00375 0.267857143 0.535714286 0.076872267 -2.565610108 304.85 0.003280302 7 0.0055 0.00275 0.0055 0.392857143 0.785714286 0.242529155 -1.416633351 317.55 0.00314911 8 0.00425 0.002125 0.00425 0.303571429 0.607142857 0.111903243 -2.190120679 313.15 0.003193358 9 0.00775 0.003875 0.00775 0.553571429 1.107142857 0.678548652 -0.387799098 322.25 0.003103181 10 0.00695 0.003475 0.00695 0.496428571 0.992857143 0.489362063 -0.714652649 323.15 0.003094538 Graph 1: Ln ksp versus 1/T graph showing slope.

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