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The concentration of NO3– in a water sample is determined by a onepoint standard addition using...

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Chemistry

The concentration of NO3– in a water sample is determined by aonepoint standard addition using a NO3– ion-selective electrode. A25.00-mL sample is placed in a beaker and a potential of 0.102 V ismeasured. A 1.00-mL aliquot of a 200.0-mg/L standard solution ofNO3– is added, after which the potential is 0.089 V. Report the mgNO3–/L in thewater sample.

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