lab9writeup - Lab 9 Phosphoric Acid Titration Curves Jazmin Agee Lab Partner Chris H Bri W Chem 112L-008 A Research Questions a What is the exact

lab9writeup - Lab 9 Phosphoric Acid Titration Curves Jazmin...

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Lab 9: Phosphoric Acid Titration Curves Jazmin Agee Lab Partner: Chris H, Bri W Chem 112L-008 March 29, 2016 A. Research Questions a. What is the exact initial concentration of the H3PO4 solution? b. What the pKa1 and the pKa2 for H3PO4? c. What are Ka1 and Ka2 for H3PO4? d. What is the H3PO4 concentration in my soft drink? B. Observations and Results Table 1. Phosphoric Acid Titration Data and Concentration Results. [NaOH] (M) Equiv point pH at equiv. point NaOH vol to reach equiv point (mL) NaOH moles (mol) H3PO4 moles (mol) Starting [H3PO4] (M) Average [H3PO4] (M) 0.103 M 1 st 2.59 12 mL 1.23 x 10^-3 1.23 x 10^-3 0.04120 0.04463 0.103 M 2 nd 4.25 14 mL 1.44 x 10^-3 1.44 x10^-3 0.04806 0.04463 Table 2. Phosphoric Acid Equilibrium Constants Equilibrium # pKa Ka 1 1.77 1.70 x 10^-2 2 1.85 1.41x10^-2 Table 3. Cola Soft Drink Titration Data and Concentration Results for Sodastream Cola Free Soft Drink [NaOH] (M) Equiv point pH at equiv point NaOH vol to reach equiv point NaOH moles (mol) H3PO4 moles (mol) Starting [H3PO4] in this cola (M) Average [H3PO4 in this cola (M) .500 1 st 4.72 7 mL 1.50 x 10^-4 1.50 x10^-4 0.00875 0.0050 .500 2 nd 5.62 8 mL 3.5 x
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  • Fall '11
  • HeatherRankin
  • Chemistry, pH, Pk, Equivalence point, Phosphoric acid

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