chemisry.Electrochemical Measurement of Concentrat

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A calibration curve to show how the cell potential varies with [Cu2+] may be constructed. A plot of cell potential (in V, with the same sense as in question 1) versus log10[Cu2+] should yield a straight line. What is the slope of this line?
The answer should be -0.0591/2 but it s not correct!!

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