Question

The junction potential develops due to charge separation                  T          F.

The junction potential in a salt bridge can be reduced somewhat if ions with similar mobilities are used inside the salt bridge.                                    T          F

Junction potentials put a fundamental limit on the accuracy of direct potentiometric measurements                                                                       T          F

The junction potential is not part of the cathode or anode, yet we usually know its contribution E_cell-.                                                                                T          F

The junction potential represents a balance between unequal ion mobilities and the tendency of the resulting charge imbalance to retard the movement of ions.                                                                                                       

          T          F         

In some pretreatment situations, the analyte must be reduced prior to titration. Of the following which does not show an analyte being converted to its reduced form(s)?

CrO₄^2- ? Cr²⁺

MnO₄^- ? Mn²⁺

Fe³⁺ ? Fe²⁺

Mo³⁺ ? MoO₄^2-

UO₂²⁺ ? U³⁺/U⁴⁺

In a pH probe, the thin glass membrane separates an inner solution of H⁺ from a sample containing H⁺. Both must be at the same concentration to develop a potential.                                                                                         T          F

In potentiometry measurements such as with ISE probes the current should be zero.                                                                                                           T          F

A junction potential can form when two solutions of different ions come into contact and when two solutions of the same ions, but different concentration, come into contact.                                                           

               T          F                                                         

An analytical disadvantage of ISE measurements is that they typically destroy the sample analyte during the measurement.                                 

     T          F

Answer 1

1. true.

2. true.

3. true.

4. false