Question

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Electrochemical Measurement of Concentration An electrochemical cell consists of a standard hydrogen electrode and a copper metal electrode. What is the potential of this cell at 25°C if the copper electrode is placed in a solution in which [Cu2+] = 3.2x10-6 M? 1 pts Submit Answer Tries 0/5 The copper electrode of the above cell is placed in a solution of unknown [Cu2+]. The measured potential at 25°C is 0.038 V. What is [Cu2+] (in mol/L)? (Assume Cu2+ is reduced.) 1 pts Submit Answer Tries 0/5 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? 1 pts Submit Answer Tries 0/5

Answer 1

* Coll potential should be From nerit equalem , the formula for coll potential al ace is given by Fecal - EP - 0.0591. log (cubm op Sitica W& 046 uning tanong Myhoergen clochrode → Ecco0.34 - 0.0601 log[3. 2x10°) the anode potentical is zoro = 0.34 - 0.0591 *(-6.494) so fcel Fouclectrode = 0.34 + 0.167 3 0.503 volt. 0.34 (frum Electro Chernis Series n = 2, cukrzé (u * Fcon = F° - 0.0 Bal long [cu" ] 70.038 V = 0.34v - 0.0691 log [cu?'] 9 0.069! log [alt] = 0.34 - 0.038 À log [c2] = 0.302 * 3 0.069) [cu 2+] 1016-219 - 16-45 X 109 M.

* from Neret equation Ecu = É - Dogal 10g [ccft ] If Ecall is taken in y axis and log [ce?t] in taxis then Where the m line equation = slope of ie y = mx te the line : Slope of the line o here Full E -0.059 So stope = - -0.0591 2