Questions from General Chemistry

Q: How does a current in an electrochemical cell affect its potential?

How does a current in an electrochemical cell affect its potential?

Q: What experimental variables affect concentration polarization in an electrochemical cell?

What experimental variables affect concentration polarization in an electrochemical cell?

Q: List the advantages and disadvantages of the hanging mercury drop electrode compared

List the advantages and disadvantages of the hanging mercury drop electrode compared with platinum or carbon electrodes.

Q: Suggest how Equation 21-13 could be used to determine the

Suggest how Equation 21-13 could be used to determine the number of electrons n involved in a reversible reaction at an electrode.

Q: Quinone undergoes a reversible reduction at a voltammetric working electrode. The

Quinone undergoes a reversible reduction at a voltammetric working electrode. The reaction is (a) Assume that the diffusion coefficients for quinone and hydroquinone are approximately the same, and c...

Q: Sulfate ion can be determined by an amperometric titration procedure using Pb2

Sulfate ion can be determined by an amperometric titration procedure using Pb2+ as the titrant. If the potential of a rotating mercury film electrode is adjusted to -1.00 V versus SCE, the current can...

Q: It has been suggested that many polarograms can be obtained on a

It has been suggested that many polarograms can be obtained on a solution without depleting the electroactive analyte. Suppose that in a polarographic experiment we monitor the limiting current for 45...

Q: An unknown cadmium (II) solution was analysed polarographically by the

An unknown cadmium (II) solution was analysed polarographically by the method of standard additions. A 25.00-mL sample of the unknown solution produced a diffusion current of 1.86 μA. Following additi...

Q: List several sources of uncertainty in pH measurements with a glass/

List several sources of uncertainty in pH measurements with a glass/calomel electrode system.

Q: (a) What are the advantages of performing voltammetry with microelectrodes

(a) What are the advantages of performing voltammetry with microelectrodes? (b) Is it possible for an electrode to be too small? Explain your answer