6) What is the voltage under standard conditons for the reaction: 2Ag(s) + I2(s)

Question

6) What is the voltage under standard conditons for the reaction: 2Ag(s) + I2(s) ? 2Ag+(aq) + 2I-(aq)?

13)What is the standard voltage or cell potential of a Cr-Hg cell? (Remember to switch one-half reaction to oxidation and to balance the number of electrons--use paper.)

Cr3+(aq)+ 3e- ? Cr(s) Eo = -0.74 V
Hg2+(aq)+ 2e- ? Hg(l) Eo = +0.789 V

What is the voltage under standard conditions for the reaction: 2Ag(s) + I2(s) ? 2Ag+(aq) + 2I-(aq)? What is the standard voltage or cell potential of a Cr-Hg cell? (Remember to switch one-half reaction to oxidation and to balance the number of electrons--use paper.) Cr3+(aq)+ 3e- ? Cr(s) Eo = -0.74 V Hg2+(aq)+ 2e- ? Hg(l) Eo = +0.789 V

Explanation / Answer

13)

Cr3+(aq)+ 3e- ? Cr(s) Eo = -0.74 V
Hg2+(aq)+ 2e- ? Hg(l) Eo = +0.789 V

the lowest reduction voltage gets reversed as its most readily oxidised (loss of electrons) ie Cr becomes oxidised
therefore,

Cr(s)+Hg2+(aq) ?Cr3+(aq)+Hg(l) Eo = +0.789 V- (-0.74 V)= +0.789 V+0.74 V = 1.529v

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