Consider a phase stability diagram for the Cu-O-S system as a plot of y-log10(ps

Question

Consider a phase stability diagram for the Cu-O-S system as a plot of y-log10(psoz) vs x=loglo(Poz) at T = 1000 K-constant. Consider only the solid phases: Cu20, CuO, and CuSO4. The three possible pairwise combinations are: (1) Cu2O/Cuo (2) Cu20 /CuSO4 (3) Cuo CuSO4 For each pairwise reaction, write the balanced reaction with (only) the gas phase species O2 and SO2. Evaluate KRxN at 1000 K and write it in terms of the gas phase partial pressures. Take the logio of both sides, then rearrange to the form: where m and b are evaluated numbers. Each result will plot as a straight line. The slope m may be + or -Vertical or horizontal lines are also possible - Kformation, 1000 CuSO4 4.3x1020 Cu20 9.1x104 CuO SO 3.5x103 7.7x1014

Explanation / Answer

The balanced equations will be

Cu2O(s) + 0.5 O2 (g)--> 2CuO (s)

K = pO2-1/2

Cu2O + SO2 (g) + 5/2O2 ---> 2CuSO4

K = 1/ ((pSO2)(pO2)5/2

CuO + SO2 + 1/2O2 ---> CuSO4

K = 1/1/ ((pSO2)(pO2)1/2

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