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Given the data at 25°C, Ag + I− → AgI + e−; E° = 0.152 V Ag → Ag+ + e−; E° = −0.800 V What is the value of log Ksp for AgI? (2.303 RT/F = 0.059 V)

1. −8.12
2. +8.612
3. −37.83
4. −16.13

Correct answer: −16.13

Solution

The value of log Ksp for AgI is derived from the Nernst equation, which relates the standard electrode potentials to the solubility product constant. By calculating the overall cell potential for the dissolution of AgI and using the provided constants, we find that log Ksp equals -16.13, indicating a very low solubility for AgI.

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