Asked by tevon

When an ion-selective electrode for X was immersed in 0.0210 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 at 25°C, and that the activity coefficient of X is 1.
Answered by DrBob222
I would think you could use the Nernst equation, use the standard to calculate Eocell (they give you the concn XCl as well as Ecell). Then knowing Eocell you can calculate concn XCl when they give you Ecell for the unknown.
Answered by David
The Equation is going to be
E = constant + (0.05916)log[X]
find constant first
use that constant to find the new []
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