The figure shows the effect of pHpH on the response of a nitrite (NO2-) (NO - 2

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The figure shows the effect of pHpH on the response of a nitrite (NO2-) (NO-2) ion-selective electrode immersed in 1 μM NaNO2+1 mM NaCLl. 1 μM NaNO2+1 mM NaCLl. The authors recommend using the flat region near pH5.5pH5.5 for measuring nitrite. To a first approximation, we expect the electrode to respond to [NO2-][NO-2] by the equation E=constant-(59 mV) log [NO2-].E = constant - (59 mV) log [NO-2].
a. Look up pKapKa for nitrous acid and explain the behavior of the curve at pH<4.pH < 4.
b. Suggest an explanation for the behavior at pH>6.pH > 6.

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Quantitative Chemical Analysis

ISBN: 9781319164300

10th Edition

Authors: Daniel C. Harris, Charles A. Lucy

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