Answer
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Work Step by Step
$\ \ \ \ H_2C_2O_4+H_2O\leftrightarrow HC_2O_4^-+H_3O^+\ -->K_{a1}$
$+ \ HC_2O_4^-+H_2O\leftrightarrow H_2C_2O_4+OH^-\ --> K_{b2}$
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$\ \ \ \ 2\ H_2O\leftrightarrow H_3O^++OH^-\ --> K_w$
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