What is the pH at the equivalence point for the titration of 0.20 M aqueous nitrous acid by 0.20 M aqueous sodium hydroxide? K_a for nitrous acid is 4.5 × 10^-4 A)5.83 B)7.00 C)8.17 D)9.00 E)10.67

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Quizplus · Accepted Answer

At the equivalence point, the solution contains the conjugate base of nitrous acid, which is nitrite ion (NO2-). The pH is determined by the hydrolysis of this ion. Using the Kb value derived from Kw/Ka, the pH is calculated to be approximately 8.17.

What Is the PH at the Equivalence Point for the Titration