Determine the value of #E^@#?

For the reaction Cl2(g) + 2Fe2+(aq) ⇌ 2Fe3+(aq) + 2Cl-(aq) the value of Eo is 0.59 V.

The value of Eo for Fe3+(aq) + Cl-(aq) ⇌ 1/2 Cl2(g) + Fe2+(aq) is
-1.18 V
-0.59 V
-0.30 V
0.30 V
0.59 V

1 Answer
Junaid Mirza
May 28, 2018

#-"0.59 V"#

Explanation:

#"Cl"_"2(g)" + "2Fe"_"(aq)"^"2+" ⇌ "2Fe"_"(aq)"^(3+) + "2Cl"_"(aq)"^(-) color(white)(...)"E"^@ = 0.59\ "V"#

Now, the reaction is reversed and amount is halved on both the sides. Represented as below

#"Fe"_"(aq)"^(3+) + "Cl"_"(aq)"^(-) ⇌ 1/2"Cl"_"2(g)" + "Fe"_"(aq)"^"2+"#

As the reaction is inverse of previous one the #"E"^@# value changes from positive to negative. #"E"^@# is an intensive property. Therefore its magnitude remains same.

∴ #"E"^@# value of second reaction is #-0.59\ "V"#

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