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When an ion-selective electrode for X was immersed in 0.0240 M XCl, the measured potential was...

When an ion-selective electrode for X was immersed in 0.0240 M XCl, the measured potential was 0.0270 V. What is the concentration of X when the potential is 0.0420 V? Assume that the electrode follows the Nernst equation, the temperature is at 25°C, and that the activity coefficient of X is 1.

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