Here is the answer for the question – **When an ion-selective electrode for X+ was immersed in 0.0655 M XCl, the measured potential was 0.0480 V. What is the concentration of X+ when the potential is 0.0630 V? Assume that the electrode follows the Nernst equation, the temperature is 25 C, and that the activity coefficient of X+ is 1.**. You’ll find the correct answer below

### When an ion-selective electrode for X+ was immersed in 0.0655 M XCl, the measured potential was 0.0480 V. What is the concentration of X+ when the potential is 0.0630 V? Assume that the electrode follows the Nernst equation, the temperature is 25 C, and that the activity coefficient of X+ is 1.

**The Correct Answer is**

**The potential of the ion-selective electrode E depends only on X+.E = constant + 0.05916/n log[X+]0.0480 = constant + 0.05916log(0.0655) = 0.1180.0630 = 0.118 + 0.05916log[X+][X+] = 0.12 M**

### Reason Explained

The potential of the ion-selective electrode E depends only on X+.E = constant + 0.05916/n log[X+]0.0480 = constant + 0.05916log(0.0655) = 0.1180.0630 = 0.118 + 0.05916log[X+][X+] = 0.12 M is correct for When an ion-selective electrode for X+ was immersed in 0.0655 M XCl, the measured potential was 0.0480 V. What is the concentration of X+ when the potential is 0.0630 V? Assume that the electrode follows the Nernst equation, the temperature is 25 C, and that the activity coefficient of X+ is 1.

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