Calculate \( K_{a_{1}} \) for dibasic acid if its concentration is \( 0.05 \mathrm{~N} \) and \(...

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Calculate \( K_{a_{1}} \) for dibasic acid if its concentration is \( 0.05 \mathrm{~N} \) and \( \mathrm{pH} \) at this concentration is 3. Assume second dissociation constant very less.
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