Unformatted text preview: provided, put 1.00 mL of the organic acid solution into test tube 1, 1.00 mL of the organic salt solution, 1.00 mL of 0.100 M HCl into test tube 3 and 1.00 mL of 0.100 M NaOH into test tube 4. Using the methods from class, predict the pH that should be found for each of these solutions. Using the Pasco system, determine the pH of each of these solutions experimentally. Calculations: Part I: Recall from class that when [HA(aq)]=[A-(aq)], the resulting solution has pH=pK a , and the relationship between Gibb’s Free Energy and the equilibrium constant, K=-RTlnK. Part II: Recall van’t Hoff’s equation from class, and the relationship between Gibb’s free energy, enthalpy and entropy; ∆ G o = ∆ H o-T ∆ S o ; recall that we need to solve this at 25 o C to determine the change in entropy. Part III: Recall the Henderson-Hasselbach equation from class. Use the value of pK a determined in part I....
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- Fall '11
- JosephWalter
- Chemistry, pH, Test Tube, hot water bath, Gibb’s Free Energy
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