Report Form for Phosphoric Acid Titration Curves

Report Form for Phosphoric Acid Titration Curves - Report...

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Report Form for Phosphoric Acid Titration Curves Chemistry 112 Lab Section 005 November 4, 2014 A. The research questions for this lab are: 1. What is the initial concentration of the H 3 PO 4 ? 2. What are pK a1 & pK a2 (and Ka 1 & Ka 2 ) for H 3 PO 4 ? 3. What are the H 3 PO 4 concentrations in my soft drink? B. Observations & Results Tables Summarize your data in the following tables. 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) H 3 PO 4 moles (mol) Starting [H 3 PO 4 ] (M) Average [H 3 PO 4 ] (M) 0.1023 1 st 4.5 pH 12.75 1.304 x 10 -3 1.304 x 10 -3 0.043 0.048 2 nd 10 pH 15.50 1.586 x 10 -3 1.586 x 10 -3 0.053 Table 2. Phosphoric Acid Equilibrium Constants. Equil # pKa Ka 1 2.25 5.62 x 10 -3 2 7.25 5.62 x 10 -8 Table 3. Cola Soft Drink Titration Data and Concentration Results for SodaStream Dr. Pete [NaOH] (M) Equiv point pH at equiv point NaOH vol to reach equiv point (mL) NaOH moles (mol) H 3 PO 4 moles (mol) Starting [H 3 PO 4 ] (M) Average [H 3 PO 4 ] (M) 0.05115 1 st 4.5 pH 2.25 1.151 x 10 -4 1.151 x 10 -4 2.88 x 10 -3 4.32 x 10 -3 2 nd 9.35 pH 4.50 2.302 x 10 -4 2.302 x 10 -4 5.75 x 10 -3
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Table 4. Phosphoric Acid Concentration in Various Cola Soft Drinks Cola name [H 3 PO 4 ] (M) SodaStream Cherry Cola 0.01183 SodaStream Cherry Cola 0.00475 SodaStream Cherry Cola 0.0703 SodaStream Cherry Cola 0.00607 SodaStream Cherry Cola 0.01022 SodaStream Cherry Cola 0.007665 SodaStream Dr. Pete 0.00432 SodaStream Dr. Pete 0.00430 C. Complete claims for each of the research questions above. Include appropriate units.
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