A 50.0-mL sample of .10 M HNO2 (ka = 4.0 * 10 ^-4) is titrated with 0.12 M NaOH. what is the pH after 25.0 mL NaOH have been added?

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A 50.0-mL sample of .10 M HNO2 (ka = 4.0 * 10 ^-4) is titrated with 0.12 M NaOH. what is the pH after 25.0 mL NaOH have been added?

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