General Chemistry 4th Edition University Science BookS presented by Sapling Leam

Question

General Chemistry 4th Edition University Science BookS presented by Sapling Leaming Points Possible The voltage generated by the zinc concentration cell described by Grade Category Zn(s)Zn2+(aq, 0.100 M)IZn®(aq, ? M)|Zn(s) is 25.0 mV at 25 °C. Calculate the concentration of the Zn2 (aq) ion at the cathode Policies: You can check You can view s give up on any You can keep t until you get it You lose 5% of answer in your attempt at that Number eTextbook Help With Thi Web Help & Previous Give Up & View Solution e Check Answer Next Exit Technical Su Hint

Explanation / Answer

as both electrode are of Zn so, (E0)cell = 0
use,
E = (E0)cell - (0.059/2)*log([Zn+2]a/[Zn+2]c)
n = 2
E = 25 mV
= 0.025
so,
0.025 = 0 - (0.059/2)*log(0.100/[Zn+2]c)
log(0.100/[Zn+2]c) = 0.848
(0.100/[Zn+2]c) = 7.05
[Zn+2]c = 0.0142 M

Answer : 0.0142 M

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