Thermodynamics of Borax Solubility - Thermodynamics of...

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Introduction to General, Organic and Biochemistry
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Thermodynamics of Borax SolubilityTaylor BlackCassie PressnallCHEM 112L-005April 13, 2016 A.Research Questions1.How does the temperature of a solution affect the Ksp value? 2.What are the ΔG, ΔH, and ΔS values for the reaction?3.How can you tell you have reached the equivalence point in the titration?B.Observation & ResultsTable 1. Titration of Borax data at different temperaturesMolarity ofHCl (M)TrialVolume ofHCl (mL)Volume ofsaturatedborax sample(mL)Temperature(°C)TemperatureK0.50 M12.34 mL7.0 mL8.6 °C281.6 K22.67 mL7.0 mL10.3 °C283.3 K33.85 mL7.0 mL11.0 °C284.0 K44.25 mL7.0 mL20.2 °C293.2 K55.06 mL7.0 mL23.3 °C296.3 K64.22 mL7.0 mL23.9 °C296.9 K74.43 mL7.0 mL24.9 °C297.9 K86.02 mL7.0 mL29.4 °C302.4 K97.11 mL7.0 mL30.2 °C303.2 K107.67 mL7.02 mL33.0 °C295.0 K119.27 mL7.0 mL34.8 °C307.8 K128.03 mL7.0 mL40.3 °C313.3 K1312.08 mL7.0 mL45.4 °C318.4 K1413.75 mL7.0 mL51.0 °C324.0 K1518.4 mL7.0 mL51.8 °C324.8 K1614.0 mL7.0 mL51.7 °C324.7 K1725.13 mL7.0 mL53.0 °C326.0 KTable 2 Borax Calculations Moles of HCl (mol)Moles of tetraborateion (mol)Moles of sodium ion)Concentration ofn (M)Concentration ofn (M)KspLn (Ksp)Temperature (K)1/Temperature (K-1)10.00120.000590.001120.0840.1672.33x10-3-6.05281.60.00355
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20.00130.000670.00130.0950.1913.46x10-3-5.66283.30.0035330.00190.000960.00190.1380.2751.03x10-2-4.57284.00.0035240.00210.001060.00210.1520.3041.40x10-2-4.27293.20.0034150.00250.001270.00250.1810.3612.36x10-2-3.75296.30.0033760.00210.001060.00210.1510.3011.37x10-2-4.29296.90.0033770.00220.001100.00220.1580.3161.58x10-2-4.15297.90.0033680.00300.001510.00300.2150.4303.98x10-2-3.23302.40.0033190.00360.001780.00360.2540.5086.55x10-2-2.73303.20.00330100.00380.001920.00380.2740.5488.22x10-2-2.50295.00.00339110.00460.002320.00460.3310.6621.45x10-1-1.93307.80.00325120.00400.002010.00400.2870.5749.43x10-2-2.36313.30.00319130.00600.003020.00600.4310.8633.21x10-1-1.14

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