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solution11_pdf

# solution11_pdf - toupal(rgt374 Homework 11 Sutclie(52410...

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toupal (rgt374) – Homework 11 – Sutcliffe – (52410) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. A NOTE ON CELL DIAGRAMS: There is no good explanation for this but when the diagram is more complex than A | B || C | D then you should just assume everything on the LEFT of the || is for the ANODIC reac- tion, and everthing on the RIGHT of the || is the CATHODIC reaction. Then for each of these, find a reduction half reaction in ta- ble 1.1 that includes all of the items in your anodic or cathodic reaction, and use that to write down your two half reactions. Unless Pt is listed on the far left or right; in that case it is just an inert electrode, ignore it. If you look at the given half reactions for Q2 (es- pecially the cathodic reaction), youll see how this works. 001 10.0 points Consider the cell Zn(s) | Zn 2+ (aq , 0 . 100 M) || Cl (aq , ? M) | Cl 2 (g , 0 . 500 atm) | Pt . For this cell, E = 2.12 V and E = 2.27 V at 25 C. Calculate the Cl (aq) concentration in the cathode compartment. 1. 4.3 × 10 5 M 2. 1.5 × 10 3 M 3. 6.5 × 10 3 M 4. 1.2 × 10 1 M 5. 2.9 × 10 3 M 002 10.0 points Consider the cell Pt | H 2 (1 atm); H + (? M) || Hg 2 Cl 2 (s); Cl (1 M) | Hg 2 H + + 2 e H 2 E 0 = 0 . 00 V Hg 2 Cl 2 + 2 e 2 Hg + 2 Cl E 0 = 0 . 268 V If the measured cell potential for the cell is 0 . 35 volts, what is the pH of the solution? 1. 1.39 2. 2.77 3. less than 1.00 4. 5.45 5. 4.74 003 10.0 points What is the standard free energy change for the reaction H 2 + 2 Ag + (aq) 2 H + (aq) + 2 Ag(s)? The standard potentials are 2 H + + 2 e H 2 (0 V) Ag + + e Ag (0 . 7994 V) Answer in units of kJ. 004 10.0 points Consider two hypothetical metals, X and Y, which can exist as metal ions X 2+ and Y 3+ , respectively. For these two metals, the standard potentials are X 2+ + 2 e X(s) ( - 0 . 1 V) Y 3+ + 3 e Y(s) (0 . 1 V) Calculate Δ G for the reaction 3 X(s) + 2 Y 3+ (0 . 0847 M) 3 X 2+ (0 . 2704 M) + 2 Y(s) . at 25 C. Answer in units of kJ / mol. 005 10.0 points Given the standard potentials for the half- reactions ZnS(s) + 2 e Zn(s) + S 2 - 1 . 440 V Zn 2+ + 2 e Zn(s) - 0 . 763 V calculate K sp for ZnS at 298.15 K.

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