Phosphoric Acid Titration Curves - Phosphoric Acid...

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Phosphoric Acid Titration CurvesAnthony UpshawPartner: Brock HarrisChemistry 112LApril 3rd2016
A. Research Question:a)What is the exact initial concentration of the H3PO4solution?b)What are pKa1& pKa2for H3PO4?c)What are Ka1& Ka2 for H3POd)What is the H3PO4concentration in my soft drink?4?B. Observations & ResultsTablesTable 1. Phosphoric Acid Titration Data and Concentration Results[ NaOH](M)EquivpointpH atequiv.pointNaOH vol toReach equivPoint (mL)NaOHMoles(mol)H3PO4Moles(mol)Starting[H3PO4](M)Average[H3PO4](M).0991st4.714.50.001440.001440.048.025.0992nd9.328.50.00280.00280.09405Table 2. Phosphoric Acid Equilibrium Constants.Equil #pKaKa12.2450.0057211.43.98 x 10-12Table 3. Cola Soft drink titrations Data and Concentration Results for Sodastream Dr. Pete.[NaOH](M)EquivpointpH atequivpointNaOH vol toReach equivPoint (mL)NaOHMoles(mol)H3PO4Moles(mol)Starting[H3PO4](M)Average[H3PO4](M)0.051st4.44.20.00210.00210.0525.08560.052nd8.49.50.00480.00480.11875Graphs
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