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Answer to Question #18330 in Physical Chemistry for musi

Question #18330
the standard potential of the silver \silver bromed electrod is 0.073V.calculate the solubility product of silver bromide?
Expert's answer
Ksp = exp(z·E·F/R·T)
Ksp = exp(1·0.073·96485 / 8.314472· 298.15) = e^2.841 = 17.13

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Assignment Expert
15.11.12, 14:12

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<p class="MsoPlainText">Ag+& + e-& ---> Ag
(s)
Eo& = +0.800 V</p>

<p class="MsoPlainText">AgBr (s) + e-& ---> Ag (s) +
Br-& (aq)
Eo& = +0.071 V II - I : AgBr& --->Ag+ + Br- E = E_II - E_I<span style="mso-spacerun:yes">& </span>= 0.071 - 0.8 = - 0.729 V In general change
of the free Gibbs energy due to the reaction is:</p>

<p class="MsoPlainText">ΔG = z·E·F</p>

<p class="MsoPlainText">(z number of electrons exchanged in half reactions, F
Faraday's constant) The& equilibrium constant& is given by ln K = ΔG /
(R·T) = z·E·F / (R·T) (R universal gas constant, T temperature in Kelvins) ln K
= (1 ·( - 0.729 V · 96485.3383J/(molV) / (8.314472J(molK) · 298.15K)) ln K<span style="mso-spacerun:yes">& </span>= -28.375 Ksp = 4.75 * 10^-13</p>

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musi
12.11.12, 20:08

thank you it very easy but I can know what the rule you used and can also use the Nernest equation ?
E=Eْ-0.0591\n log [Br]
and then use the concentration was gotten to get Ksp
please let me if I right and help me to do that

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