Nitrous acid, hno2, has a ka of 7.1 × 10−4. what are [h3o+], [no2−], and [oh−] in 0.840 m hno2?

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Nitrous discerning, hno2, has a ka of 7.1 × 10−4. what are [h3o+], [no2−], and [oh−] in 0.840 m hno2?
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