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2. The following cell was found to have a potential of 0.2897V : SCEMg2+(a=3.32103M) membrane electrode for Mg2+ (a) When the solution of known magnesium activity was replaced with an unknown solution, the potential was found to be 0.2041V. What was the pMg of this unknown solution? (b) Assuming an uncertainty of 0.002V in the junction potential, what is the range of Mg2+ activities within which the true value might be expected? (c) What is the relative error in [Mg2+] associated with the uncertainty in Ej ? 2. List five sources of uncertainty in pH measurements with a glass-reference electrode system