I. In a galvanic cell, a. reduction occurs at the (name of electrode) b. the ano

Question

I. In a galvanic cell, a. reduction occurs at the (name of electrode) b. the anode is the (sign) electrode c. anions flow in solution toward the (name of electrode) d. electrons flow from the (name of electrode) to (name of electrode) 2 a. What is the purpose of a salt bridge? Explain b. How is the salt bridge prepared in this experiment? 3. Experimental Procedure, Part C.I. A 1-mL pipet is used to transfer 1.0 mL of a 0.10 M Cuso, solutios a le volumetric flask. The volumetric flask is then filled to the mark with deionized water. What is the mola of the diluted solution? Show calculations expressing the concentration with the correct number of sigilicen sqpen 4. Refer to Figure 32.2 and equations 32.8 and 32.9. a. What is the value of the cell constant? b. What is the (Cu"] if the measured cell potential is 0.96 V? c. What should be the cell potential if the [Cu"] is 1.0 x 10-3 mo/L? Experiment 32

Explanation / Answer

1

a. cathode

b. negative

c. anode

d. anode, cathode

2.a.

The purpose of a salt bridge is not to move electrons from the electrolyte, rather to maintain charge balance because the electrons are moving from one half cell to the other.The electrons flow from the anode to the cathode. The oxidation reaction that occurs at the anode generates electrons and positively charged ions. The electrons move through the wire, leaving unbalanced positive charge in vessel. In order to maintain neutrality, the negatively charged ions in the salt bridge will migrate into the anodic half cell. A similar (but reversed) situation is found in the cathodic cell, where Cu2+Cu2+ ions are being consumed, and therefore electro neutrality is maintained by the migration of K+K+ ions from the salt bridge into this half cell.

b. Salt bridge is prepared in lab by using a glass U-tube. Fill it up with a solution of something like potassium nitrate, or some other salt whose ions do not form precipitates with any other ions. Use two cosmetic cotton puffs to plug in both ends, and invert it quickly into both solutions taking care not to allow any air to enter the U-tube. When the circuit is complete by connecting the zinc and copper electrodes to a voltmeter, the current will flow showing you the cell voltage.

3. Molar concentration =   Amount in moles / volume of solution

                                           = 0.10 M of CuSO4 / 100

                                           = 0.0010 M CuSO4

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