What is the pH of a solution prepared by adding 1.59 g of sodium nitrite to 195 mL of water? K_a of HNO₂ is 4.5 × 10^-4. A)5.79 B)2.15 C)7.00 D)11.85 E)8.21

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Quizplus · Accepted Answer

Sodium nitrite (NaNO2) is a salt of a weak acid (HNO2) and a strong base (NaOH). It hydrolyzes in water to form a basic solution. The concentration of NO2- is calculated from the mass of NaNO2 and the volume of the solution. Using the Kb of NO2- (derived from Kw/Ka of HNO2), the pOH is calculated, and then converted to pH. The pH is approximately 8.21.

What Is the PH of a Solution Prepared by Adding