What is the percent dissociation of HNO2 when 0.074 g of sodium nitrite is added to...

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What is the percent dissociation of HNO₂ when 0.074 g of sodium nitrite is added to 115.0 mL of a 0.068 M HNO₂ solution? K_a for HNO₂ is 4.0 × 10^–4.

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