lab write up #11 - Kyla Lee Chemistry 112 Lab Section 011...

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Kyla Lee Chemistry 112 Lab Section 011 Kate Truler 04/21/11 Lab #11 Thermodynamics of Borax Solubility Research Questions: 1) How does the temperature of your solution affect the Ksp? 2) What are the ΔG°, ΔH°, and ΔS° of the reaction? Observations and Results: Table 1. Molarity of HCl (M) Trial Volume of HCl (mL) Volume of saturated sample (mL) Temperature (°C) 0.101 M 1 12.7 mL 7 mL 10°C 2 19.9 mL 7 mL 20°C 3 33.2 mL 7 mL 30°C 4 40.2 mL 7 mL 40°C 5 71.3 mL 7 mL 50°C Table 2. Trial Moles if HCl (mol) Moles of tetraborat e ions (mol) Moles of sodium ion (mol) Conc. of tetrabo rate ion (M) Conc. of sodium ion (M) Ksp In(Ks p) Temp (K) 1/Temp (K -1 ) 1 1.28*10 -3 6.40*10 -4 1.28*10 -3 0.091 0.183 0.003 -5.81 283 0.0035 2 2.01*10 -3 1.01*10 -3 2.01*10 -3 0.144 0.287 0.012 -4.42 293 0.0034 3 3.35*10 -3 1.68*10 -3 3.35*10 -3 0.240 0.479 0.051 -2.98 303 0.0033 4 4.06*10 -3 2.03*10 -3 4.06*10 -3 0.290 0.580 0.098 -2.32 313 0.0032 5 7.20*10 -3 3.60*10 -3 7.20*10 -3 0.514 1.029 0.544 -0.61 323 0.0031 Calculations on lab notebook page 96. Claims: 1) The temperature of the solution affects the Ksp by making it greater. 2) The ΔG° is 9,724.22J, the ΔH° is 103,925, and the ΔS° is 316.11 for this reaction.
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