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What is the percent dissociation of HNO 2 when 0.064 g of sodium nitrite is added to 120.0 mL of a 0.057 M HNO 2

What is the percent dissociation of HNO ₂ when 0.064 g of sodium nitrite is added to 120.0 mL of a 0.057 M HNO ₂ solution? Ka for HNO ₂ is 4.0 x 10 ^-4.

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