Predict whether the following reactions would occur spontaneously in aqueous solution at 25 °C. Assume that the initial concentrations of dissolved species are all 1.0 M
Predict whether the following reactions would occur spontaneously in aqueous solution at 25 °C. Assume that the initial concentrations of dissolved species are all 1.0 M
Predict whether the following reactions would occur spontaneously in aqueous solution at 25 °C. Assume that the initial concentrations of dissolved species are all 1.0 M
Predict whether the following reactions would occur spontaneously in aqueous solution at 25 °C. Assume that the initial concentrations of dissolved species are all 1.0 M
Ca (s) + Cd 2+ (aq) ----> Ca2+ (aq) + Cd (s)
2Br - (aq) + Sn2+ (aq) ----> Br2 (l) + Sn (s)
2Ag (s) + Ni2+ (aq) ----> 2Ag+ (aq) + Ni (s)
Cu+ (aq) + Fe3+ (aq) ----> Cu2+ (aq) + Fe2+ (aq)
For a spontaneous reaction Eocell must be
positive
Eocell = Ecathode -
Eanode
Ca ----------> Ca+2 + 2e-
Eanode = -2.87 V
Cd+2 +
2e- ------> Cd Ecathode = -0.40 V
Eocell = -0.40 - (-2.87) = 2.47V , Hence
first reaction is spontaneous
2Br- + 2e- -----------> Br2
Ecathode= -1.07V
Sn+2 --------> Sn + 2e- Eanode=
-0.14V
Eocell = -1.07 - (-0.14) = -0.93V , Hence the
second reaction is not spontaneous.
The third reaction does not take place
Fe+3 + e- --------->
Fe+2 Ecathode = 0.77V
Cu+ -----------> Cu+2 +
e- Eanode = -0.150V
Eocell = 0.77 - (-0.150) = 0.92V ; Hence
fourth reaction is spontaneous.
Predict whether the following reactions would occur spontaneously in aqueous solution at 25 °C. Assume that...
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