Experiment 26 Report Sheet Thermodynamics of the Dissolution of Borax Date A. St

Question

Experiment 26 Report Sheet Thermodynamics of the Dissolution of Borax Date A. Standardized HCI Solution Calculate the mass of sodium carbonate sample required in Part A.3 Lab Sec. ? ??? Name Desk No. Trial I Trial 2 Trial 3 Trial 4 1. Tared mass of Na CO, (g) 2. Moles of Na,CO, (mol) .Buret reading, initial (mL) 4. Buret reading. final (m) 5. Volume of HCI added (ml.) 6. Moles of HCl added (mol) 7. Molar concentration of HCI (moVL) 8. Average molar concentration of HCI (moVL) 2569H0 10 23.1O 296110- B. Preparation of Borax Solution Sample number 1. Volume of sample (mL) 2. Temperature of sample (°C) 5.0050000 5.00500 500 560 480 -40-D 32.025,0 2-0 C. Analysis of Borax Test Solutions i. Buret reading, inirial (mL) 552 a lalime or NCb to S5o 3:32 2. Buret reading, final (mL) 55 Experiment 26 313 249

Explanation / Answer

Data analysis

Sample number 1 2 3 4 5 6 Temperature, T(K) 329.15 321.15 313.15 305.15 298.15 275.15 1/T (K-1) 3.038 x 10-3 3.114x10-3 3.193 x10-3 3.277 x 10-3 3.354 x 10-3 3.634 x 10-3 moles of HCl used (mol) 5.4656 x 10-3 3.6966 x 10-3 3.66 x 10-3 8.1008 x 10-4 1.09312 x 10-3 6.222 x 10-4 moles of B4O5(OH)42- (mol) 2.7328 x 10-3 1.8483 x 10-3 1.83 x 10-3 4.0504 x 10-4 5.4656 x 10-4 3.111 x 10-4 [ B4O5(OH)42-] (mol/L) 0.54656 0.36966 0.366 0.0810 0.1093 0.0622 molar solubility of borax (mol/L) 0.54656 0.36966 0.366 0.0810 0.1093 0.0622 Solubility product Ksp 0.6531 0.2020 0.196 2.126 x 10-3 5.225 x 10-3 9.635 x 10-4 ln Ksp -0.426 -1.60 -1.63 -6.153 -5.25 -6.945

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