In bowen's discontinuous reaction series, the first mineral to crystallize out of a mafic melt is __________ .
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If the concentration of fluoride anion and aluminum cation was increased to 5M, then there would be decrease in Ecell by 0.055 volts
The standard reduction potential of Fluoride anion and aluminum cation are -
2Al -----> 2Al3+ + 6e- cell = +1.66
6e- + 3F2 -----> 6F- cell = +2.87
The complete reaction is -
2Al + 3F2 ------> 2Al3+ + 6F- = +4.53
Using Nernst Equation :-
E = – 0.0592/n*log[Al3+]^2[F-]^6
n = 6 (n = number of transferred electrons)
E = +4.53 - 0.0592/6*log(5)^2(5)^6
E = +4.53 - 0.00987*log(25)(1.56 x 10^4)
E = +4.53 – 0.00987*log(3.9 x 10^5)
E = + 4.53 -0.00987(5.59)
E = + 4.53 - 0.055
E = +4.47
The change in Ecell = 5 - 4.47 = 0.055V
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