Question

By adding 2 mL 1 M HNO3, 2 mmol BaCO3 is dissolved and quantitatively transferred to a 100 mL volumetric flask and diluted to the mark. Take 45 mL of the solution to an Erlenmeyer flask and add 10 mL NH3 solution to adjust the pH to 10.00. The analyte is then titrated with 0.03 M EDTA. (a) What’s the molarity of the NH3 solution. Note, a buffer solution is formed, for NH3, Kb = 1.8×10-5. (b) What is the pBa at equivalence point? log Kf = 7.88 for Ba2+, αY^4– = 0.30 at pH = 10.00.

          By adding 2 mL 1 M HNO3, 2 mmol BaCO3 is dissolved and quantitatively transferred to a 100 mL volumetric flask and diluted to the mark. Take 45 mL of the solution to an Erlenmeyer flask and add 10 mL NH3 solution to adjust the pH to 10.00. The analyte is then titrated with 0.03 M EDTA. (a) What’s the molarity of the NH3 solution. Note, a buffer solution is formed, for NH3, Kb = 1.8×10-5. (b) What is the pBa at equivalence point? log Kf = 7.88 for Ba2+, αY^4– = 0.30 at pH = 10.00.

Added by Joseph B.

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