1.

A 0.100M aqueous solution of H_(2)SeO_(3) is titrated with 1.000M NaOH solution. At the point marked with a circle on the titration curve, which species represent at least 10% of the total selenium in solution ?

Answer»

`H_(2)SeO_(3)` only
Both `H_(2)SeO_(3)` and `HSeO_(3)^(-)`
`HseO_(3)^(-)` only
Both `HSeO_(3)^(-)` and `SeO_(3)^(2-)`

ANSWER :C


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