In Addition to Redox Indicators and Starch-Iodine Complex,the Equivalence Point

question 4

Multiple Choice

In addition to redox indicators and starch-iodine complex,the equivalence point for a redox titration can be determined using a Gran plot.Which is NOT true for Gran plots?

• A)Gran plots give best results using redox data well before the equivalence point.
• B)Gran plots are constructed by plotting the volume titrant added on the x-axis and V  10^{−nE/0.05916} on the y-axis.
• C)The plot of V versus V  10^{−nE/0.05916} is a straight line with the x-intercept = equivalence point volume.
• D)Constant ionic strength over the course of the titration minimizes error in the equivalence point.
• E)Gran plots are more error prone than first derivative and second derivative plots.

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