Chemistry Lab report 7 - Phosphoric Acid Titration Curve November 3 2015 A Research Question 1 What is the exact initial concentration of the H3PO4

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

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Phosphoric Acid Titration Curve November 3, 2015
A.) Research Question 1. What is the exact initial concentration of the H 3 PO 4 solution? 2. What are pK a1 &pK a2 for H 3 PO 4 ? 3. What are K a1 &K a2 for H 3 PO 4 ? 4.What is the H 3 PO 4 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) H 3 PO 4 Moles (mol) Starting [H 3 PO 4 ] (M) Average [H 3 PO 4 ] (M) 0.099 1st 4.36 12 1.188 0.0373 0.306 0.0533 0.099 2nd 8.34 21 2.079 0.0693 0.306 Table 2: Phosphoric Acid Equilibrium Constants Equil # pK a K a 1 1.85 1.4*10^-2 2 6.97 1.07*10^-7 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 ]in this cola (M) Average [H 3 PO 4 ] (M) 0.0495 1st 4.75 2 0.099 0.0025 0.408 0.00754 0.0495 2nd 8.82 4 0.198 0.005 0.408 -Graphs attached separately Calculations:

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• Fall '11
• U
• Chemistry, pH, Pk, Equivalence point, Phosphoric acid, Equiv. pH

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