Abstract
The enthalpies of reactions between alkaline-earth cuprates M 2CuO 3 (M = Ca, Sr) and hydrochloric acid were measured in a hermetic swinging calorimeter at 298.15 K. The M 2CuO 3 samples were prepared by solid-phase synthesis from calcium or strontium carbonate and copper oxide and characterized by X-ray powder diffraction, EDX and wet analysis. The standard enthalpies of formation obtained for the cuprates, −1431 ± 4 kJ mol −1 for Ca 2CuO 3 and −1374 ± 3 kJ mol −1 for Sr 2CuO 3, are discussed and compared with previous experimental and assessed values.
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