_{1. In one experiment you measure the voltage of a galvanic cell based on the reaction:}

2 Hg(l) + 2 Cl^-(std KCl) + 2 AgCl(s) = 2 Ag(s) + 2 Cl^-(aq) + Hg₂Cl₂(s)

If the voltage of the cell is 125 mv when the [Cl^-] = 0.02 M, what is the voltage when the [Cl^-] is 0.0003 M?

_{2. A 0.5403 g sample containing Ca is dissolved in HCl, diluted and, after neutralization, the calcium is precipitated as the oxalate. After filtering and washing, the calcium oxalate is redissolved in acid and then titrated with 26.76 mL of 0.1102 N potassium permanganate. What is the % Ca in the sample.}

3. Calculate the potential for the BOTH of the following two reactions. Show your work in detail for both reactions.  

2 Fe⁺³(aq,0.01 M) + Sn⁺²(aq,.1 M) = Sn⁺⁴(aq,0.002) + 2 Fe⁺²(aq,0.00005 M)

4 Fe⁺³(aq,0.01 M) + 2 Sn⁺²(aq,.1 M) = 2 Sn⁺⁴(aq,0.002) + 4 Fe⁺²(aq,0.00005 M)

_{4. What would be the equilibrium constant for the reaction:}

2 Fe⁺³(aq) + Sn⁺²(aq) = Sn⁺⁴(aq) + 2 Fe⁺²(aq)

5. 4.65 mL of 0.23 N S₂O₃^-2 will react with what weight of O₂ in a redox reaction? (O₂ + 4e^- + 4H⁺ = 2 H₂O)

6. Z⁺ goes to HZ in a reaction. How many electrons are gained or lost in the half cell? Be specific.

_{7. In the table of potentials given below, what species is the best oxidizing agent?}

_{8. In the table of potentials given below, what species is the best reducing agent?}

_{Br2 + 2 e}^- _{= 2 Br}^- _E^o _{= 1.065 v}

Fe⁺³ + e- = Fe⁺² Eo = 0.771 v

Sn⁺⁴ + 2 e^- = Sn⁺² E^o = 0.15 v

Zn⁺² + 2 e^- = Zn E^o = - 0.763 v

9. Z⁺ goes to HZ⁺ in a reaction. In the reaction it _______ electrons.

_{a) gains 2 b) gains 1 c) does not transfer d) loses 1 e) loses 2}

10. Cu⁺²+ 2e^- = Cu E^o = 0.337 v

Ag⁺ + e^- = Ag E^o = 0.799 v

_{A cell is based on the reaction}

Cu + 2 Ag⁺= Cu⁺² + 2 Ag

_{This cell is ______________ with a voltage of ___________ volts.}

_{a) spontaneous, 0.462 b) spontaneous, 1.136 c) spontaneous, -0.462 d) nonspontaneous,0.462 e) nonspontaneous,-0.462}