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# For which of the following solutions can the Henderson-Hasselbalch equation not be used to calculate the pH?

For which of the following solutions can the Henderson-Hasselbalch equation not be used to calculate the pH?

I. 0.15 M HNO2(aq)

II. 0.3 M HNO2(aq) plus 0.60 M NaNO2(aq)

III. Equal volumes of 1.0 M HNO2(aq) and 0.95 M NaOH(aq)

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- DoctorwhoLv 77 years agoFavorite Answer
I. 0.15 M HNO2(aq)

The Henderson-Hasselbalch equation requires that the conjugate species (conjugate base for an acid, and conjugate acid for a base) be present in the system. In the examples given , only (I) has no conjugate base present.

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