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Lesson 1: Galvanic Cells, Standard Hydrogen Electrode and Electrochemical Series — Picture questions (exam style)

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1.
A Sn/Sn2+ (1 M) half-cell is joined to the standard hydrogen electrode as shown; the voltmeter reads 0.14 V and the Sn electrode is negative. What is E° for Sn?
A Sn/Sn²⁺ (1 M) half-cell is joined to the standard hydrogen electrode as shown; the voltmeter reads 0.14 V and the Sn electrode is negative. What is E° for Sn?
-0.14 V
0.00 V
-0.07 V
+0.14 V