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A 20.0 mL sample of a 0.20 M solution of...

A 20.0 mL sample of a 0.20 M solution of the weak diprotic acid `H_(2)A` is titrated with 0.250 M NaOH. The concentration of solution at the second equivalent point is:

A

`0.10` M NaHA

B

`0.153 M Na_(2)A`

C

`0.10 M Na_(2)A`

D

`0.0769 M Na_(2)A`

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