Reference no: EM131926163
The black tarnish that forms on pure silver is the sulfide Ag2S, formed by reaction with H2S in the atmosphere:
4 Ag + 2 H2S + O2 2 Ag2S + 2 H2O
The sulfide forms in preference to Ag2O, even though the atmosphere is 20% O2 with just a trace of H2S. Explain this by selecting all that apply.
a. Formation of the sulfide is consistent with the HSAB principle.
b. Silver is a soft Lewis acid.
c. Oxygen is a hard Lewis base.
d. Silver is a hard Lewis acid.
e. Hydrogen sulfide is a soft Lewis base.
f. Hydrogen sulfide is a hard Lewis base.
g. Oxygen is a soft Lewis base.
h. Formation of the sulfide is not consistent with the HSAB principle.
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