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Nitrous acid has a Ka of 4.0x10-4. Calculate the pH when 40.00 mL of 0.125 M...

Nitrous acid has a Ka of 4.0x10-4. Calculate the pH when 40.00 mL of 0.125 M HNO2 is titrated against 0.200 M NaOH and reaches the equivalence point.

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