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What is the acidity constant for the fol...

What is the acidity constant for the following reaction given that the hydronium ion concentration of a 0.04 M solution of `Ni^(2+)` solution of nickel(II) perchlorate is `4.5xx10^(-6)`?
`Ni^(2+)(aq.)+2H_(2)O(l)hArrNi(OH)^(+)(aq.)+H_(3)O^(+)(aq.)`

A

`2xx10^(-12)`

B

`4xx10^(-6)`

C

`5xx10^(-12)`

D

`5xx10^(-10)`

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