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15.0 mL of 0.50 M HCl is added to a 100.-mL sample of 0.493 M HNO2...

15.0 mL of 0.50 M HCl is added to a 100.-mL sample of 0.493 M HNO2 (Ka for HNO2 = 4.0 × 10–4). What is the equilibrium concentration of NO2 – ions?

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