Question

Assume you wish to determine the concentrations of Ca$^{2+}$ in an aqueous sample containing both Ca$^{2+}$ and Ni$^{2+}$ using an EDTA titration. This can be done by titrating two aliquots (1 and 2) each at different pH values (pH = 4 and pH = 8). The experiment was done as follows: [EDTA] = 0.06650 M Volume of Aliquot 1 = 10.00 mL pH of Aliquot 1 = 4 Equivalence volume for aliquot 1 (pH = 4) = 4.49 mL Volume of Aliquot 2 = 10.00 mL pH of Aliquot 2 = 8 Equivalence volume for aliquot 2 (pH = 8) = 15.80 mL Calculate the concentration of Ca$^{2+}$ in the sample. Report your answer to three (3) significant digits.

          Assume you wish to determine the concentrations of Ca$^{2+}$ in an aqueous sample containing both Ca$^{2+}$ and Ni$^{2+}$ using an EDTA titration. This can be done by titrating two aliquots (1 and 2) each at different pH values (pH = 4 and pH = 8).
The experiment was done as follows:
[EDTA] = 0.06650 M
Volume of Aliquot 1 = 10.00 mL
pH of Aliquot 1 = 4
Equivalence volume for aliquot 1 (pH = 4) = 4.49 mL
Volume of Aliquot 2 = 10.00 mL
pH of Aliquot 2 = 8
Equivalence volume for aliquot 2 (pH = 8) = 15.80 mL
Calculate the concentration of Ca$^{2+}$ in the sample. Report your answer to three (3) significant digits.

Assume you wish to determine the concentrations of Ca^2+ in an aqueous sample containing both Ca^2+ and Ni^2+ using an EDTA titration. This can be done by titrating two aliquots (1 and 2) each at different pH values (pH = 4 and pH = 8).
The experiment was done as follows:
[EDTA] = 0.06650 M
Volume of Aliquot 1 = 10.00 mL
pH of Aliquot 1 = 4
Equivalence volume for aliquot 1 (pH = 4) = 4.49 mL
Volume of Aliquot 2 = 10.00 mL
pH of Aliquot 2 = 8
Equivalence volume for aliquot 2 (pH = 8) = 15.80 mL
Calculate the concentration of Ca^2+ in the sample. Report your answer to three (3) significant digits.

Added by Derek A.

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