Nitrous acid, HNO2 has a Ka of 7.1 x10^-4 at 25 degrees C. A) write a reaction e

Question

Nitrous acid, HNO2 has a Ka of 7.1 x10^-4 at 25 degrees C. A) write a reaction equation for nitrous acid in water B) what are the hydronium ion, and nitrate ion concentrations in 0.60M HNO2? C) calculate the hydroxide concentrations in the solution from (b) Nitrous acid, HNO2 has a Ka of 7.1 x10^-4 at 25 degrees C. A) write a reaction equation for nitrous acid in water B) what are the hydronium ion, and nitrate ion concentrations in 0.60M HNO2? C) calculate the hydroxide concentrations in the solution from (b) A) write a reaction equation for nitrous acid in water B) what are the hydronium ion, and nitrate ion concentrations in 0.60M HNO2? C) calculate the hydroxide concentrations in the solution from (b)

Explanation / Answer

                  HNO2 + H2O -----> NO2- + H3O+
initially        0.6                            0    0
at equili    (0.6-x)          x x
Ka = [NO2-][H3O+]/[HNO2][H2O]
7.1*10^-4 = x*x/(0.6-x)
x = 0.02029
[NO2-] = 0.02029 = [H+]
pH = -log(H+)
pH = -log(0.02029)
pH = 1.6927
pOH = 14 - pH = 14 - 1.6927
pOH = 12.3073
[OH-] = 10^-12.3073 = 4.9283 * 10^-13

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