The junction potential develops due to charge separation T F. The junction poten
ID: 873071 • Letter: T
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 Ecell-. 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)?
CrO42- ? Cr2+
MnO4- ? Mn2+
Fe3+ ? Fe2+
Mo3+ ? MoO42-
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
Explanation / Answer
1. true.
2. true.
3. true.
4. false
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