IIT JEE , AIEEE Forum - Chemistry , Inorganic Chemistry

santosh05

wat does +ve n -ve electrode potentl signify?????

ananth_patri

Higher potential is taken as +ve and lower as -ve ....current flows from higher to lower potentila.....from +ve to -ve...in a closed circuit.....when u talk about electrodes.....the electrode where oxidation ocuures is Anode and where Reduction occurs its Cathode....

santosh05

i want 2 kno dat if 2 substances r given with 2 diff E how 2 determine which 1 ii b oxidised n which reduced???????pl tak 2 values n xplain...........

sagar90

YA ANANTH IS RIGHT,
WHEN AN ELECTRODE LOSES ELECTRON (i.e -VE CHARGE) THEN D ELECTRODE POTENTIAL BECOMES POSITIVE AND WHEN ANOTHER ELECTRODE ACCEPTS ELECTRON (-VE CHARGE) THEN ITS POTENTIAL BECOMES NEGATIVE
AND REMEMBER OXIDATION IS D LOSS OF ELECTRON

sagar90

JISNE ELECTRON DIYA WO OXIDISE HOTA HAI AUR JISNE ELECTRON LIYA WO REDUCE HOTA HAI

fire

Lets take two electrodes Zinc<Zn> and Copper <Cu>.

Zn<2+> + 2e ->Zn Reduction potential is -0.76

Cu<2+> + 2e->Cu Reduction potential is 0.34

Now since Zinc has negative reduction potential,It has less tendancy to reduce or more tendency to oxidise.Thus it is the anode as it undergoes oxidation.

Similarily Cu has positive reduction potential indicating it has more tendency to undergo reduction or less tendency to undergo oxidation...Thus it is the cathode.

THus by seeing the reduction potential we can see which undergoes reduction and which undergoes oxidation...

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