Phosphoric Acid Titration Curves - Phosphoric Acid...

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Phosphoric Acid Titration Curves Taylor Black Cassie Pressnall CHEM 112L & 005March 29, 2016A.Research Questionsa.What is the exact initial concentration of the H3PO4solution?b.What are the pKa1 & pKa2for H3PO4c.What are Ka1& Ka2for H3PO4?d.What is the H3PO4concentration in my soft drink??B.Observations & ResultsTable 1. Phosphoric Acid Titration Data and Concentration Results[NaOH](M)Equivalence pointpH atequivalence pointNaOHvolume toreachequivalencepoint (mL)NaOHMoles(mol)H3PO4Moles(mol)Starting[H3PO4](M)Average[H3PO4](M)0.103 M1st4.3313.0 mL0.0013390.0013390.04460.0455 2nd9.4826.5 mL0.0013910.0013910.0464Table 2. Phosphoric Acid Equilibrium ConstantsTable 3. Cola Soft Drink Titration Data and Concentration Results for Cherry ColaGraphs attached to the back Calculations and analysis are in notebook pagesC.ClaimsEquivalence #pKaKa12.22 pH6.03x10^-327.12 pH7.60x10^-8[NaOH](M)EquivalencepointpH atequivalencepointNaOHvolume toreachequivalencepoint (mL)NaOHMoles(mol)H3PO4Moles(mol)Starting[H3PO4]in thiscola(M)Average[H3PO4]in thiscola(M)0.0515 M1st5.52 8.0 mL0.0004120.0004120.1030.05442nd7.4812.5 mL0.0002310.0002310.00579
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