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What is the hydronium ion concentration ...

What is the hydronium ion concentration of a `0.02` M solution of `Cu^(2+)` solution of copper(II) perchlorate? The acidity constant of the following reaction is `5xx10^(-9)`.
`Cu^(2+)(aq.)+2H_(2)O(l)hArrCu(OH)^(+)(aq.)+H_(3)O^(+)(aq.)`

A

`1xx10^(-5)`

B

`7xx10^(-4)`

C

`5xx10^(-4)`

D

`1xx10^(-4)`

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