Q10(a). Thermometric titration of Ca²⁺ and Mg²⁺

The EDTA titration of mixtures of Ca²⁺ and Mg²⁺ can be followed thermometrically. Sketch the thermometric titration curve for a mixture of 5.00 × 10⁻³ M Ca²⁺ with 5.00 × 10⁻³ M Mg²⁺ with 0.0100 M EDTA. The heats of formation for CaY²⁻ and MgY²⁻ are respectively −23.9 kJ/mol and −23.0 kJ/mol. (Given: log K₁ for Ca²⁺–EDTA complex = 10.69 and log K₁ for Mg²⁺–EDTA complex = 8.79)