Answer to Question #234617 in General Chemistry for Nana

Question #234617

Calculate the pH of a solution that is 0.253 M in nitrous acid (HNO₂) and 1.687 M in potassium nitrite (KNO₂). The K_a value of nitrous acid is 4.50 × 10^-4.

Expert's answer

Ka = [H⁺][NO₂^-]/[HNO₂]

4.5x10-4 = x(1.687)/.253 X = 3.0 x 10^-3

pH = -log 3.0 x 10^-3 =2.5

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