For a nitrate ion selective electrode, the selectivity factor for nitrite over nitrate is 0.062 and that for nitrate over perchlorate is 990. What is the percent error in the measurement of a 1.50 mM nitrate solution in the presence of each interfering ion at a concentration of 0.10 mM?

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Q: explain types of reference electrode?

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Potentiometric Titrations

Potentiometric titration is one of the important titration methods and is mainly carried out to characterize acid solutions. It follows a method similar to that of the normal titration technique, but the main difference is that there is no indicator used in the potentiometric titrations. Instead of using an indicator, electrodes are employed for monitoring the whole titration process. A scientist named Robert Behrend did the potentiometric titration for the first time, and it was done using the mercurous solution and potassium chloride.