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...

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Extracted text: 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?