What is the [OH^(-)] in a suspension of ...

What is the [`OH^(-)`] in a suspension of the antacid `Mg(OH)_(2)`? (`K_(sp)=2.06xx10^(-13)`)

`7.4xx10^(-5)`M

`5.9xx10^(-5)`M

`4.7xx10^(-5)`M

`3.7xx10^(-5)`M

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