The Previous Problem Demonstrated How To Find The Total Or Initial Concentration Of Weak Acid H A In The Analyte 1 (106.27 KiB) Viewed 33 times
The previous problem demonstrated how to find the total or "initial" concentration of weak acid ([H₂A] in the analyte solution from data at the first equivalence point. Together with the pH of the solution before titration is begun, [H₂A]; can be used to calculate the pk of H₂A. H₂A(aq) + H₂O(1) ⇒ HA¯(aq) + H3O+ (aq) In one trial, the pH of the analyte solution before titration was 2.67 and [H₂A]; was 5.79 mM. Determine the equilibrium concentrations of H3PO4, H₂PO4, and H3O+ and calculate the resulting value of pK (H₂A). Enter your response without units to the nearest 0.01. Note: do not assume that the equilibrium hydronium concentration is small relative to the initial acid concentration!
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in the analyte solution from data at the first equivalence point. Together with the pH of the solution before titration is begun, [H₂A]; can be used to calculate the pk of H₂A. H₂A(aq) + H₂O(1) ⇒ HA¯(aq) + H3O+ (aq) In one trial, the pH of the analyte solution before titration was 2.67 and [H₂A]; was 5.79 mM. Determine the equilibrium concentrations of H3PO4, H₂PO4, and H3O+ and calculate the resulting value of pK (H₂A). Enter your response without units to the nearest 0.01. Note: do not assume that the equilibrium hydronium concentration is small relative to the initial acid concentration!