Chemistry Lab report 7 - Phosphoric Acid Titration Curve...

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Phosphoric Acid Titration CurveNovember 3, 2015
A.) Research Question1. What is the exact initial concentration of the H3PO4solution?2. What are pKa1 &pKa2for H3PO43. What are Ka1&Ka2for H3PO4?4.What is the H3PO4concentration in my soft drink?B.) Observations and Results?Table 1: Phosphoric Acid Titration Data and Concentration Results.[NaOH] (M)Equiv. PointpH at equiv. PointNaOH vol to reach equiv point. (mL)NaOH moles (mol)H3PO4Moles (mol)Starting [H3PO4] (M)Average [H3PO4] (M)0.0991st4.36121.1880.03730.3060.05330.0992nd8.34212.0790.06930.306Table 2: Phosphoric Acid Equilibrium ConstantsEquil #pKaKa11.851.4*10^-226.971.07*10^-7Table 3: Cola Soft Drink Titration Data and Concentration Results for Sodastream Dr.Pete[NaOH](M)Equiv. PointpH at equiv. PointNaOH vol to reach equiv point. (mL)NaOH moles (mol)H3PO4Moles (mol)Starting [H3PO4]in this cola (M)Average [H3PO4] (M)0.04951st4.7520.0990.00250.4080.007540.04952nd8.8240.1980.0050.408-Graphs attached separatelyCalculations:

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