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Determine K for the reaction : H2C2O4(...

Determine K for the reaction :
`H_2C_2O_4(aq)+2OH^(-)(aq) to C_2O_4^(2-)(aq)+2H_2O(l)`
`H_2C_2O_4(aq)K_(a_1)=6.5xx10^(-2), K_(a_2)=6.1xx10^(-5)`
`H_2O K_w=1.0xx10^(-14)`

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